Looks a whole lot of fun but very dangerous. I expect she knew the depth she was diving (obviously) and prepared for a dive like she would a dive into a shallow pool (but knowing it was shallow - people have broken their necks on holiday, not realising the depth of a pool they were diving into). Maybe a more shallow descent would have been advised. Or not doing this mad stunt at all. How cold would it have been, eh! ;) :)