but the only ones I know of are in the Casio Exilim line. Be sure to add lots of light to the subject. You may have a trade-off to make... The EX-ZR100 can get up to 1000 fps - but it was designed to be a still image capture device - not a video capture device - and it is not waterproof. A waterproof case is likely available from a third party. Depth in water will mean more $ to protect your camera. I would not trust a $30 waterproof case.

The waterproof cameras can't go very deep. Fighting pressure is bulky and expensive.