I have attached some pics of a new ROV I am about to test this week. All BR components in a single 4’ acrylic tube. This ROV is designed for two roles. Primary one is to inject invasive Crown of Thorns starfish (which are destroying much of the Great Barrier Reef) with either vinegar or bile salts which kills them. The orange bag has the poison in it. The other device bolted on is a sedative dispersant which allows for collecting rare small reef fish. The motor reverses to suck them into the container once sedated.
As you can see, I have run the motor wires inside the acrylic tube necessitating drilling holes into the tube