This interesting article on SV Seeker discusses the various ways of making a tether for a remotely operated vehicle (ROV). They experimented ... and wrapping the cable in polypropylene rope ...

The camera signal is brought back to the controller through the same cable. Simple is the key to the build, and we have to admit that for all of its Minimum Viability, the little ROV has a lot ...

The remotely operated vehicle (ROV) is lowered down to the seabed to find a faulty section of cable After narrowing down the possible area for the fault, the operation moves to the ROV team.