Answer: paravanes

AnswerCrossword Clue
PARAVANESDevices used by minesweepers.
PARAVANESMine sweeps on ships
paravanesA device towed behind a boat at a depth regulated by its vanes or planes, so that the cable to which it is attached can cut the moorings of submerged mines
paravanesPARAVANE, an underwater device used to cut cables