Meet the OpenROV Trident: a drone that lets you explore what’s happening underwater. Trident combines the benefits of an ROV and an AUV, making you feel as though you are flying it underwater. It uses a buoyant tether for capturing video underwater.
Trident is extremely hydrodynamic. It comes with a WiFi topside buoy. It offers up to 3 hours battery life. The software is open source. More information is available on Kickstarter.