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Forms of overhead diving with a physical ceiling are cave-diving, ice-diving, and wreck-diving. Decompression diving is a form of diving with a virtual ceiling. The mandatory decompression stops are your 'overhead environment'. No matter how many open water dives you have, open water diving does not prepare you for overhead environment diving. If you want to engage in overhead environment diving you need special training. You will need extra equipment and training to be able to dive in overhead environments. And for each specific type of overhead environment you need specific training. With 'overhead environment diving', just like with 'open water diving', there is no such thing as an "accident". The best way to approach 'overhead environment diving' is to first make sure that your basic diving skills are very good. After that, you contact a qualified instructor, and ask him for information about courses for diving in the overhead environment of your choosing. Entering an overhead environment without preparation is asking for trouble. To quote Benjamin Franklin: "By failing to prepare you are preparing to fail". When you dive with the right attitude and the right preparation, diving in overhead environments can be a very safe and rewarding experience.
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