Southern exposure - Commercial diver training in New Zealand
Contributed by Simon
article will hopefully be of interest to divers considering a career in commercial
diving or wishing to complete a commercial course for other reasons. Hopefully
it will give you a bit of an insight into what to expect. Especially if you
plan to do the course in New Zealand (only one training agency there - New Zealand
School of Commercial Diver Training). Others may just be interested out of morbid
curiosity, what's commercial diving all about?
As someone already trained and working as a scientific diver I probably came
at the course from a different angle than most people. For me, the course was
a requirement so I could continue to act in the role of Diving Officer at my
place of work (Southern Cross University). I feel this gave me a somewhat different
perspective than most people on the course in that I didn't really want to work
as a construction diver.
Most divers on the course I participated in seemed to aspire to a career in
the on-shore or particularly the lucrative off-shore dive industry (where salaries
can range up to several thousand dollars a day). Also, studying in a different
country and with little time I was particularly focused on getting through the
course material and finishing everything I needed to for the qualification.
Most of the other course participants were there for the long hall, aiming to
finish up to ADAS (Australian Diver Accreditation Scheme) level 3.
Why do ADAS level 1?
In 1999 Standards Australia released a standard for occupational diving AS2299.1
and shortly after a standard for diver training AS2815. These standards apply
to construction divers (people working off-shore on oil rigs and on-shore doing
vessel hull inspections, construction work and soforth). AS2815 specifies training
requirements for everything from SCUBA diving to 30 metres (ADAS level 1), to
surface supply to 30 (level 2) and 50 metres (level 3) and beyond to saturation
diving (where divers live and work at pressure for extended periods of time).
Most construction work on-shore is done on surface supply, so people wishing
to work in this area usually need to be qualified up to level 2. This course
also provides training in pneumatic tools, welding and other skills needed by
construction divers. In level 1 only basic hand tools are used (like wood and
metal saws, chisels, spanners, lift bags, cameras and basic survey tools).
The level 1 course is the first step in a long and expensive road culminating
in increasingly higher pay packets. Deservedly so in what is reputedly the second
most dangerous profession. A profession that, in the past particularly, can
leave participants with significant long term health problems.
Generally these standards do not directly relate to scientific divers like me
(although level 1 is considered an entry level commercial qualification suitable
for scientific diving and similar professional work using SCUBA). Of more relevance
to universities and research centres is AS2299.2, which came out in 2002. This
standard applies specifically to scientific diving and is the benchmark that
we are expected to apply in all our diving operations (along with relevant Workcover
guidelines). Failure to do so could result in massive fines for individuals
Although there are other routes to qualify as a scientific diver under AS2299.2,
the Diving Officer for an institution (me) must be trained to the equivalent
of AS2815.1 (ADAS level 1, level 2 if overseeing surface supply but we don't
do that). Other scientific divers can be qualified with cheaper and more specialised
courses (some run through ADAS - controversy exists about the validity of other
ways to achieve competency under the standard).
Originally I had tried to get in on a course in Australia. Unfortunately,
due to the off-shore diving boom after Hurricane Katrina and other factors there
is a high demand for off-shore divers, they would only accept students wanting
to do up to ADAS level 3. Despite applying early enough the course filled up
and I missed out.
I could have gotten on to a course later in the year but didn't think my colleague
would be too happy if I left him with a bunch of marking at that time. There
was a course on offer in New Zealand starting in late July (mid winter). Overall
I think the entire trip would have cost around $8000 with the course costing
me about $4500 alone (be aware most prices in Australia at least will go up
significantly next year). ADAS level 1 is internationally recognised.
Shack by the lake
My first impressions of Huntly (where I was based for the duration of the
course) were not that encouraging. Huntly is a mining town and there is a large
coal fired power station that dominates the landscape. On the outskirts of town
the bus I was in was passed by a ute with a wild boar strapped to the roof.
New Zealand I was told (at least away from the major cities) is very much "frontier
country", with hunting and fishing major pass times. Our principal instructor
loved to share his hunting exploits during quite times and every dive shop is
stocked with gear to catch "crays" and abalone (I'm not used to divers
being able to take anything).
photograph shows my cabin by the lake. The blue bag is my cool bag for fruit,
veg and milk. In the first few days the air temperature outside the cabin was
actually colder than the fridge in the camp kitchen...
The camp site facilities were basic but the locals (at least in the camp) were
friendly, if a bit rough around the edges. Because I had so much dive gear to
carry I didn't have any bedding. Nor did I have any food for the first night.
One of the instructors kindly offered me his lunch/dinner and the camp owners
came through with a sleeping bag and a heater. A couple of trips to nearby Hamilton
with other guys from the course over the next few days secured sheets, towels
and cutlery for the duration.
I met most of the other students on the first night and following morning.
There were eleven of us completing level 1 from start to finish and three divers
who arrived about two weeks into the course to complete it by RPL (Recognition
of Prior Learning - in other words people who already worked in the commercial
industry and just needed certification).
We had quite a mix of participants on the course with several ex-navy guys,
people working in the recreational dive industry and a few guys who had only
recently got into diving or had dived mostly for recreation or finding a meal.
All guys, apparently they do occasionally have ladies doing the course but given
some of the antics on the course I'm not sure how that would play out (by tradition
the last night is spent in a very "scanky" strip joint in Hamilton,
There was a lot of colourful language and banter (apparently you need to "harden
up" to work in the commercial industry) and a couple of robust personalities,
but I count myself fortunate to have had such a great bunch of people to do
the course with. Apparently divers have a pretty poor reputation around Huntly
and Hamilton, being banned from many reputable (and not so reputable) establishments.
On the first night the police came around and recorded all the number plates
of the divers cars and apparently divers have a lot of street cred as an earlier
crew burnt down the club house belonging to a local gang.
In mid winter Huntly is a very windy and wet place. Andrew, who shared the
cabin with me for the first couple of weeks, explained that being such a narrow
strip of land New Zealand doesn't usually hold weather. The adage "if you
don't like the weather, wait five minutes" is disturbingly accurate (as
is the Crowded House song "Four seasons in one day" which I had a
lot of trouble getting out of my head for the duration - as a side note Huntly
is not that far from Ti-Awamutu, another song to try and get out of my head).
I dried all my gear each night with a heater in the cabin as there was rarely
more than an hour of sun, "occasional showers" was pretty much a given.
The ground was constantly wet and keeping cloths, dry-suit thermals and bedding
dry was a priority. One of the reasons I chose the cabin I did (on advice) was
because it received more sun than some of the cabins and consequently stayed
Some light reading
Although the theory component of the course was not that far removed from
recreational diving you had to know the material inside and out. There were
five exams in total and most questions were short answer (no multiple choice).
I thought we would do an exam a week but we ended up doing all the exams over
two days which was pretty tough going. There were exams on diving physiology
and medicine, using the tables, physics and calculations (calculating lift,
suction, gas required, etc), equipment and a final three hour exam combining
all these topics.
material provided included; the Australian Standard for commercial diving (AS2299.1),
a diving operations manual and a study guide covering all the topics we were
assessed on plus the theory component for practical exercises. Some of the topics
in the study guide included such things as; an introduction to occupational
diving and AS2299.1, diving physics (gas laws principally), anatomy and physiology,
diving maladies, dangerous marine life (pretty much all Australian), equipment
(everything from how different regulators work to compressors), dive procedures,
how to use the DCIEM tables, calculations for commercial divers, use of tools,
rigging and underwater search patterns.
For the first few weeks of the course I was studying till 11.30 each night
and on weekends in my cabin/drying oven...
I would recommend anyone contemplating a commercial course get hold of the study
guide and other material well ahead of time. It's a lot to absorb during the
course. It would also help to familiarise yourself with the DCIEM tables and
the rules for using these tables (eg. the rules for repetitive divings). Fortunately
I had a bit of a head start as we are required to use the Canadian tables for
our work dives.
The class room work was a bit disjointed at times I felt but the instructors
certainly new their stuff and were well versed in the material. Basically the
lectures covered pretty much what was in the book and important material was
highlighted and revised. I found it helpful to mark all the highlighted material
with small post-it notes to find it easily and study for the exams. Much of
the material needed to be rote learnt; anatomical features, signs and symptoms
for various maladies, equipment schematics and so forth. There were around 20
sets of review questions in the notes that needed to be completed and these
were very similar to the exam questions.
Caffeine and other popular drugs
I often don't sleep well at the best of times and add a fair bit of stress
and a different bed and diet and you can imagine I did not fare well for the
duration. I hate coffee so energy drinks were the order of the day when I needed
to function. However, I stuck to my guns on another front and kept away from
the other mainstream drug of choice that was popular when there was a break
or during the end of course festivities.
on we were all advised to visit the chemist and buy some ear drops to stave
off ear infections in the cold, wet conditions. Other drugs got added to the
mix later. I brought some herbal tablets from OZ to help keep colds and flu
at bay and a bad experience on one of the dives caused me some ear pain prompting
me to use a decongestant spray to make sure this didn't happen again.
Add all this up and include the very limited range of culinary options in Huntly
(there were four chinese takeaways, none of which appeared to sell anything
resembling actual chinese food, and not much else) and I felt in serious need
of "detoxing" by the time I got back to Auckland at the end of the
trip. My last days in NZ were in an expensive hotel in the city centre stuffing
myself silly on gourmet food, stuff the budget.
The photograph on the right shows what I took to keep diving. Vosol was to
protect against ear infections in the cold, fresh water lake. Otrivine is a
steroid nasal spray to open up the eustacian tubes (started taking on advice
from one of the RPL guys after one dive when I hurt my ears a bit), Thoat-Clear
was to stave off colds and the V was a substitute for sleep. I'd show you what
I looked like after a week and a half without much sleep (start of course) but
it's not pretty...
Dressed for success
One of my pet hates in diving is flimsy, plastic, poorly designed equipment
and accessories commonly sold in most dive shops. I think in diving you need
to be able to rely on your gear and there's no excuse for flimsy, cheaply made
gear. There are few enough chances to get out and enjoy the underwater world
without some silly problem stopping you diving. Your enjoyment, work sometimes
and occasionally survival depends on your dive gear. Worth then taking a bit
of time, and maybe extra expense, to get solid reliable gear.
The dive gear used by commercial divers (at least at this level) has some commonality
with recreational dive gear and some notable differences. For recreational and
scientific diving I use either a double or single tank DIR style equipment configuration.
I was please to discover that a stainless backplate with one piece harness and
single tank wing seemed to be pretty much the standard for commercial diving
in NZ. My Scubapro jet fins and stainless straps were also embraced warmly (commercial
divers seem to have a similar philosophy to me in that gear needs to be tough
and reliable, no silly rubber straps or cheap plastic clips to break - time
is money and you have to be able to rely on your gear).
However, that's pretty much where the similarity ends. Commercial diving is
a different paradigm and the different approach to diving is reflected in equipment
choices and how that equipment is configured and used.
In most recreational diving (and I use the term broadly to encompass technical
and cave diving as well) divers are relatively autonomous underwater and need
to be self sufficient and able to deal with problems when they arise. Consequently
the buddy system (extend this to three man team where applicable) has evolved
where by divers render assistance to one another should a problem arise during
the dive. Assisting in an out of air being the most critical role for a buddy.
Equipment and procedures in recreational diving are set up around this autonomous
free swimming paradigm (obviously I think the DIR system is the ultimate expression
of this paradigm but that argument is for another time).
In commercial diving however the biggest difference is that the diver is physically
connected to the surface by a shot line. In most cases the diver also has continuous
contact with the surface through voice communication ("comms"). The
divers shot line is tended so line can be let out or taken in as needed. The
diver has a redundant air supply and a safety diver is fully kited up and standing
by on the surface should a problem arise.
Should a problem arise the commercial diver can be immediately located (by
following his/her shot line). You will notice the dive gear pictured below has
no "octopus" regulators (or no long hoses to facilitate air sharing
underwater). The diver or team of divers is not autonomous, rather if there
is a problem the diver either switches to a bailout and exits the water, is
pulled up to the surface by their tender or the standby diver is sent in (following
the divers shot line) to perform a rescue.
The gear pictured below is not that well laid out but the RPL guys were meticulous
about reducing clutter and making all the hoses and lines slick to avoid entanglement.
There are a lot of entanglement hazards in commercial diving and the slicker
your gear the better.
Arthur (another RPL guy) showed me some nice pictures of guys rigged for surface
supply work. Very slick (all hoses and lines were kept close to the body and
secured to avoid entanglement).
of my pet hates in recreational (and scientific) diving is cluttered, messy
equipment layouts. Having cluttered gear; reduces response time in an emergency
or in finding critical bits of kit like inflators or weight belt releases, creates
drag, creates unnecessary entanglement hazards and just makes a diver look sloppy
and uncoordinated. Worse, if this sloppy attitude is carried forward into more
challenging diving (cave and technical diving for example), as is more and more
often the case, the consequences can be far more serious.
Prior to every dive a detailed pre-dive check is conducted where-by the supervisor
runs through the divers equipment with each diver and their tender and performs
gas shutdowns and switches and comms checks. Divers must all have knives suitable
for cutting through thick umbilical lines and these knives must be immediately
accessible. Divers must also locate shot lines (and check they're secure), weight
belt releases, inflators, purge masks and perform other checks. All tank pressures
(including ponys, stand-by divers and O2 cylinders) and dive start and end times
are meticulously recorded on the myriad of check lists and dive sheets.
of the equipment configurations used during the course are pictured here. The
first two setups show AGA/Interspiro Divator MK II full face masks with either
a belt block or inverted pony (move your cursor over the images for further
details). These were the setups we used most often during the course...
We used a Scubapro FFM with belt block but no photo's (I have one of these
at home). They are reasonably comfortable but by separating nose and mouth they
create problems with fogging and I found it hard to make myself understood over
comms with this mask. I also find the fitting for installing a mouth piece inside
the mask gets in my way when I try to talk.
Favorite setup? Hmm... probably an AGA with an inverted pony is the slickest
but if setup right (custom length hoses to reduce clutter) I reckon an AGA with
a belt block would be the best/safest option. Either way the AGA (once I got
used to it) was by far my favourite mask. I can see why they are so popular
in the industry.
The Kirby Morgan Exo is shown here on the left, a great mask (if you don't
mind salt water aspiration). Some people loved them some people hated them but
everyone agreed they breathed wet. I liked the mask first time I used it but
second time round it fogged badly and this in part contributed to some erratic
depth changes that hurt my one ear a bit. After that I dove with fins on every
dive (so I had a bit more control) and made sure the mask was properly defogged...
Make no mistake however, a full face mask (particularly with comms) is noisy,
very buoyant (annoying) and claustrophobic at times (on the surface in particular).
I found it very disconcerting that I couldn't just take my mask off or reg out
whenever I felt like it. On the surface or underwater. Having the
mask clamped on my head was very distressing at first and it took me a few dives
to start feeling OK about that on the surface before a dive. One suggestion
a friend made was helpful though, rinsing my face with fresh, cold water before
putting the mask on helped a lot to relax me. Apparently this stimulates the
mammalian dive reflex? I just know it felt a whole lot better and cooled me
down a bit at the same time.
When rescues were performed we were required to wear fins but at other time
they were optional. Most people felt they were in the way when working in the
cage (lifting pipe work and so forth). I didn't feel I had much control of my
position or depth without my fins and this contributed to hurting my ear a bit
on one dive because I couldn't swim up properly to control my own depth. Consequently
I wore fins on most dives after that.
here to [expletive deleted] spiders", what about the diving?
We did 24 dives on the course for predetermined times and depths (to meet
requirements specified under AS2815.1). Most of our diving was done off a large
barge owned by the NZSCDT, the "Big Pearl". The Big Pearl is set up
specifically for SCUBA and surface supply diving with a large generator, compressor,
storage banks, cage and winch, diving bell and two large shipping containers
to house the recompression chamber, dive gear and control stations.
The water is 60-90 metres deep below the Big Pearl, we worked either off the
shore (first 4 dives) or suspended in a cage below the Big Pearl. Vis ranged
from zero to 2m and the water temperature was 9-12 degrees (there wasn't much
light below about 20 metres). The diving was noisy and very rushed (diver changeovers
were meant to take 5-7 minutes including swapping tanks, kiting down, kiting
up and pre-dive checks).
On most days we arrived around 8 am at the equipment storage containers on
campus and loaded up all personal gear and any additional fuel and equipment
we needed onto the "Little Pearl", a smaller barge. We then had a
five minute trip to the boat ramp in the back of the truck or barge.
Two of the most stressful days for me on the entire course (OK slightly less
stressful than the exams) were when I acted as assistant supervisor and then
supervisor. Each day
a different student performed the role of supervisor and it was their job to
make sure we had everything needed for the days diving, oversee the diving operations,
complete most of the paperwork and assign tasks. This was by far the most taxing
job and I was pleased to get it over and done with early.
Fortunately, I wasn't the first though, that pleasure fell to Andrew, my room
mate. I was assistant supervisor on that day which gave me a good introduction
to the different personalities and strengths of all the other divers, the different
jobs required and the mountain of paperwork. We didn't have to fill out dive
plans but there were daily risk assessments (that we needed to convey to all
divers and crew), checks for various equipment (introduced gradually), pre-dive
check lists, logs for each diver (their profile, tasks, gas use, etc), planning
for repetitive diving, paperwork to keep track of everyones progress for the
course and so forth.
All this and keeping track of and taking part in all the activity above and
below (diver comms) water. Oh, and we also had to dive at some point.
I think a hall mark of good planning and leadership (for want of a better word)
is identifying peoples strengths and weaknesses and playing to those. In this
context I think as much as possible it was useful to choose the right people
for critical jobs. The days flowed much more smoothly when this was done. It
seemed to me the supervisor could facilitate or hinder the success of a diving
operation. I found this aspect of the course very informative and rewarding.
and retrievals at the boat ramp were always entertaining (this is where a lot
of the group dynamic came to the front, not always in a good way). Once the
Little Pearl was in the water everyone loaded up and we headed out to the Big
Pearl for someone (usually the supervisor) to play chicken with the electric
fence before setting up the gear for another days diving. On the right: launching
the Little Pearl (always entertaining). Too many chiefs and not enough indians
often made for some chaotic launches and retrievals and the odd harsh word...
the left here, another days diving begins in earnest. Clearly some thought has
gone into the psychology of group dynamics because I really felt like a student
/ newby diver wearing those orange and blue overalls (instructors in yellow)...
Diving with a tender was a new experience for me. I found it could be either
a positive or negative experience depending on the tender I had and the level
of control I felt I had (which depended a bit on how well I could communicate
what I needed to the surface, not always easy with so much action topside).
The tender performs a very important function and I was told that good tenders
are highly prized. Having a shot line and tender is one of the principle differences
between the commercial and recreational diver.
The tender has an extremely important role in maintaining the comfort and safety
of the diver (this brief summary will not do justice to the job). The tender
often sets up the dive equipment (as well as coiling and securing the shot line
and setting up comms), they keep the diver comfortable on the surface with food
or drink or other needs, they help the diver kit up and perform pre-dive checks,
they assist divers in and out of the water, they do a bubble check in the water,
they help the diver kit down and in some circumstances control a divers ascent
and descent rate and relay instructions to the diver using line signals. Most
importantly the tender maintains tension on the shot line and minimises slack
(which can entangle divers) while still allowing divers to move around easily
at the work site.
In general I found the diving a whole lot less stressful than tendering or
working on the surface in other roles (such as supervisor). My most enjoyable
experiences during the course were doing the zero vis search patterns early
on in the course. The tender controls the process with line signals ("face
shot and turn left", "face shot and turn right", etc) so as a
diver you really just need to move along feeling through the mud for the objects
you're searching for and responding
to the signals. Having done a large amount of work in zero vis I found this
quite relaxing. Unfortunately, every now and again I'd find what I was
searching for and have to surface.
Tenders are not the only ones who need to be aware of the shot line however.
Divers also need to be aware of their line and how it is positioned underwater.
This became particularly important when we moved off-shore and started diving
in a steel cage lowered to depth below the Big Pearl. It was important that
divers avoid tangling each other on descent or during a dive. Very easy to do
if you start swimming around each other on descent or while working (without
being aware of lines crossing). You also need to be aware of where you entered
the cage. Divers needed to think about where they would enter the cage so they
avoided tangling the lines of other divers and also to make sure that their
shot line was as free and unimpeded as possible. It was equally important to
exit the cage in the same way you entered and avoid getting tangled in pipe
work and other hazards in the cage.
the right, Simon K and Craig are ready to hit the water on the Big Pearl. Notice
the big yellow knives in the white sheaths on the left shoulder D-ring. We had
to make our own, needed to be long enough and sharp enough to cut through air
lines (pictured in the background), comm's and hydraulic lines in one motion.
It was stressed however that cutting shot lines was an absolute last resort
(in most cases any problems you can't solve yourself are solved by sending in
the standby diver)...
As the previous picture shows yes there were people wearing wetsuits. In fact
out of 14 divers on the course (including the RPL guys) less than half used
drysuits. New Zealand divers are a tough bunch. I would not have even contemplated
going in the water without my drysuit.
is me, next to the diving bell (used for surface supply diving) on Big Pearl.
"High viz" clothing, steel capped boots and hard hats were the order
of the day. On one dive I looked up to see a massive pipe (must have weighted
several hundred kilo's) swinging back and forth within inches of my head. Definitely
needed your wits about you...
I was toasty with two layers of drysuit thermals (400 gram thinsulate and 300
gram polypropylene) but my hands and feet did get rather cold on a few dives.
At times I didn't have the strength to disconnect an inflator and after a 90+
minute dive my feet were so numb it took over an hour and a half before I could
walk properly or feel my toes.
I had tried to get some dry gloves for the course but on reflection this would
have been impractical. Thick (5mm) wet suit gloves were enough for these conditions
but a lot of the time I needed to dive without them so I could perform tasks
that needed dexterity. Thinner gloves may have come in handy.
is me again on the right, ready for a dive. Took me a while to get my weighting
sorted with the extra thermals and unfamiliar fresh water. There was no time
to test out weight or new gear so I did my checkout dive with a rock held between
my knees (about 2-3 kilos light)...
On the last day of the course they blasted us down to 50m very quickly ("so
we definitely got narked"). Felt rather like I was going into space (or
perhaps back to the 60's in terms of mental state). Although not my first dive
to 50 metres, my first chamber dive. Very funny experience listening to everyones
Donald Duck voices (one group in the chamber laughed for the whole 12 minute
bottom time). They got us to do various tasks like spelling our names backwards
and various maths, several of us complained that we couldn't do the questions
on the surface let alone 50 metres.
Definitely a new experience, we deco'd out on pure oxygen using the chambers
BIBS, which stands for Built in Breathing System.
Overall impressions and comments
Overall I felt the course was a positive experience, although I was pleased
to get back to Auckland at the end of my four weeks for some decent food and
eventually my own kitchen and bed back in Australia.
There are things I felt could be done better and definitely lessons learnt
on my part. A lot of new insights and material to help improve the running of
the dive operations back at work. I did enjoy the experience though and feel
that I was fortunate to have such a great bunch of people to do the course with.
Everyone was very generous and friendly.
I definitely felt the instructors knew their stuff and were obviously knowledgeable
and experienced commercial divers. Richie and Allan brought a great deal of
real world experience to their teaching and both were approachable and friendly.
I very much appreciated the way they put up with my constant questions.
The facilities and equipment were in good order and care was taken to fix any
problems before divers entered the water. Allan ordered in any extra personal
gear that we needed and this helped a great deal. Particularly for me as
I didn't have transport and needed to rely on others.
Having said that I think that training materials and techniques are really
just developing for commercial training. The instructors are working divers
but not necessarily trained educators and I think that these will improve with
time. So view the following comments in that context.
I did feel that (despite running for a month) some times we rushed through
some material that may have benefitted from further explanation or time to get
the process right. We finished a day early, finished early most fridays and
occasionally other days so there was time to spare. I would personally have
been happy to work at least one day on the weekend if needed but realise most
people wouldn't have been prepared to do that. Most locals headed home on the
weekend and were champing at the bit to get away from Huntly, can't imagine
I think at times we needed a much clearer outline of what we needed to do during
a dive. For example, when we were first asked to flood a mask how you did this
wasn't explained (and with positive pressure masks like the AGA this is very
difficult). Also with the hull survey work the difficulty in navigating with
rusty hull plates and growth and the noise (making clear communication difficult)
required more forethought and planning.
One thing that I try to do when running specialty dives or briefing divers
for recreational or scientific dives is run through the dive and each divers
role in the sequence the dive will progress. I feel that this helps people visualise
the dive in their mind (rehearse if you like). Visualising a task or sequence
of tasks has been proven to improve performance.
In my view speed comes with time and the most important thing initially is
to get the process (the sequence of events in kitting a diver up for example)
committed to memory first, so it is second nature. This can only be done by
running through the steps slowly and methodically (reinforcing neural pathways).
So that you start off doing it right and don't miss things when the pressure
There were a number of incidences where time was wasted because things had
been forgotten while everyone rushed through their jobs.
On one dive my harness had been left undone, I know I forgot to hook up the
shot line several times before the mask was put on (leaving it dangling and
putting weight on the comms line). We got much more efficient by the end (at
least in my view) but I think a more structured approach early would have helped.
I also feel the course would benefit from a more rigid overall structure. I
realise weather can dictate dive days but this is much less of an issue on a
lake than in the ocean. I know the instructors discuss each days activities,
monitored where everyone was up to and made contingencies as required, but I'd
have liked to have had a timetable and perhaps a closer link between a theory
component and the related practical work. I have also been taught that listing
learning objectives at the start of a lecture or exercise is a good practice
(also a quick overview of what will be covered, how this fits in with the curriculum
and a brief rationale).
I had some reservations about ascent rates on the course and was vocal about
this (some of the RPL guys and others commented on this to). Richie made a point
of ensuring the ascent rate required under the DCIEM tables (18m/minute) was
enforced. Some of the tenders had been a bit over zealous early on, rushing
to pull divers up (particularly problematic for us dry suit divers needing to
Further, my impression before and during the course was that the commercial
industry as a whole is somewhat behind the times on decompression and recent
trends with deep stops, use of mixed gasses and slower ascent rates (especially
near the surface). Whether this is because they are waiting on larger data sets
to highlight trends before introducing new practices I'm not sure. I'd hope
it's not just to expedite work and training. There are mechanisms for incorporating
what I consider more conservative measures into dives conducted using the DCIEM
tables. I don't think the presence of pain or other symptoms or even bubbles
in the blood is the whole story with decompression injury and I think practices
should evolve with new models and research (not just rely on established practice
or models that limit the incidence of overt signs and symptoms).
I hope these last comments have not sounded too negative because as I say I
enjoyed the course and the people and learnt a great deal. Hope this article
has been informative and you know a little bit more about what to expect out
of commercial training.