Yes. It is actually safer to enter your credit card details on the Internet than it is to give your credit card to a restaurant waiter, if the web site is using a secure ordering system. You can tell that the site is secure because the address prefix changes from http to https and a padlock appears at the bottom of your web browser.
underwater.com.au uses a secure ordering method (SSL), which means that all of the information you submit on our website is secured by industry standard 128-bit encryption. Your personal details including credit card information are encrypted during the transaction process. Once processed, your credit card details are deleted, and your other order information is stored in a secure password protected database.