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Take the PowerShot A10 and PowerShot A20 wherever you want with an optional waterproof case that is effective to a depth of 30 metres and suitable for diving , days on the beach and skiing . The tiniest deviation from any of these evolutionary shifts , and you might now be licking algae from cave walls or lolling walrus-like on some stony shore or disgorging air through a blowhole in the top of your head before diving sixty feet for a mouthful of delicious sandworms . Therefore , if your need is to take 100 + pictures per dive or per excursion ( e.g ., on a small boat and ca n't change batteries ) go with an SLR ( single lens reflex ) and set the camera so that it only displays on the LCD for a few seconds after the picture is taken ( to assure that you have actually got a decent picture . In order to fetch a binary copy of DIVE , follow this link . To qualify these comments , let me first say that we have eaten all over the world in dives and top eateries . Soon anglers realised that they could cast their fishing lines over the side , and swimmers saw that the height provided a good platform for diving . In order to fetch a binary copy of Dive , select one of the platforms below . The current generation of dive computers are based on more current research work on Decompression Sickness and just how nitrogen ( the cause of Decompression Sickness ) is exchanged during diving . Breakage of coral ranged from an average of 0.6 per dive to 1.9 per dive . Research in the Red Sea and Caribbean suggests that reefs can sustainably support around 5000-6000 dives per dive site per year , but that greater levels of use cause a rapid rise in diver damage . I 'm rarely suprised by the net any more , and I rarely open my mouth unless I already know the ultimate outcome before diving in to net.politics . Shipwrecks also testify to the dangers , and are sites for diving for the more intrepid visitors to the park . Check the water depth before diving into a swimming pool and never dive into an above-ground pool . And after two years in crisis mode , she was looking forward to goofing off for a while before diving back into work . The type , length , frequency of dive and the type of operation increase the already high risk of this strenuous work . At Beaumaris , 20 kilometres south-east of Melbourne , you can reach a secluded beach via a coastal path along the sloping sandstone cliffs at the Ricketts Point marine sanctuary , which is also a good spot for diving and snorkelling . Do n't dive in areas not made for diving . Between 1991-1994 diving intensity increased 70 % and coral cover declined at two-thirds of dive sites and in all three reserves , suggesting a background stress unrelated to tourism .