Here is a drone that you can use underwater to view HD footage. The Fathom One is a full HD drone with a modular, portable design. You can connect it to your smartphone wirelessly to explore underwater environments without having to get wet.
The Fathom One has detachable thrusters, so you can always customize and upgrade your device. Want to attach action cameras, lights, or other sensors to your device? The integrated rail system lets you do just that. The Fathom One has a max speed of up to 3 knots and max operating depth of 150 feet.