We produces research and development of underwater drones on 3D printing technology. In our developments we use only 3D printing technology for optimal production process. In the details of our drones we use composite plastic with the addition of carbon fiber. Underwater drone i-GOR can dive to a depth of 10 meters and make video the underwater world. On request it is possible to install research equipment and equipment for environmental monitoring on board.Float Station needed for radio transmission from board underwater drone. Link to i-GOR https://www.cgtrader.com/3d-print-models/hobby-diy/robotics/u-scan-for-3d-print Link to float station https://www.cgtrader.com/3d-print-models/hobby-diy/robotics/float-st
So it looks like you're trying to do for underwater what quadcopters did for the air. I like that idea!