Meet the FiFish Atlantis: a smart remotely operated underwater vehicle that lets you take videos and view them in high-definition in real-time. It has various sensors for navigation, sonar, and depth detection. Since it has multiple modules, you can extend FiFish Atlantis’ capabilities easily. It operates up to 100 meters underwater. The battery lasts two hours on a full charge.
FiFish Atlantis can be controlled underwater using a joystick or above the water with a remote control. You can find out more about it here.