Meet the Blueye X1: a mini ROV developed for underwater research. It has a reinforced frame and can be equipped with various external payloads. You can also use it with the Newton gripper for manipulating things under water. The X1 has a USB-C charger. The battery lasts up to 5 hours on battery.
You can control this robot with a remote or an app on your smartphone. The Blueye X1 has a 3300lm work light for dark conditions. The above video shows it in action.