Here is another underwater robot with powerful engines, leakproof structure, and 4K camera that lets you explore any body of water. The FIFISH P3 robot has 4000 lumens LED lights with 8 adjustable levels. Its camera has a 162-degree field of view.
This ROV is rated to a depth of 100 meter. It runs on battery for 2 hours and has max speed of 1.5m/s. You also get a simple controller with an adjustable mount that supports smartphones and tablets up to 7.9″.