Meet the OpenROV Trident: a cool robot for underwater exploration. It combines the versatility of an ROV and the efficiency of an AUV, making you feel as though it is flying underwater. It allows you to capture video underwater easily thanks to its buoyant tether.
Trident is extremely hydrodynamic. It comes with a WiFi topside buoy. The battery life lasts up to 3 hours. The software for this product is open source, which is a plus. Trident is available on Kickstarter.