Here is an awesome drone designed specifically for underwater exploration. The Blueye Pioneer Drone can be controlled from your smartphone, tablet, or using goggles. It can explore to depths of up to 150 meters. The battery life lasts up to 2 hours.
The Pioneer ROV has a full HD camera to record your dives in 1080p resolution. It also has LED lights, self-stabilization, and powerful thrusters for challenging dives.