So you've got a GoPro and a thirst for underwater footage. Unless you're wearing scuba gear, you're probably not going to be able to take it very far down. That's where the Seawolf GoPro Submarine comes in. This submersible vehicle has a built-in waterproof mount for your camera, can reach depths of 30 feet, and can wirelessly transmit live video back to either your phone or a dedicated screen, thanks to a tethered connection to a mini surface boat. A 100% tethered model is also available with up to 30m of cable, and there's an optional Pelican case for keeping all your gear safe during transport.