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Nope... you don't need any specialist equipment as you do not go in the water, its a decent sized tank that has glass on one side so you can see into it

The model does 'her thing' in the water and we photographers stand next to that 'window' and take pictures

Tankspace - behind the scenes_11.jpg

ah so you don't get the camera under at all? interesting ! I was always a bit nervous of it as I struggle a bit with underwater lol. Has that always been how it's done? I swear I used to see the photography go under too.