How survey ships expose devices placed on the seabed

Are modern survey ships useful for detecting devices that navies place on the seabed?

Yes. HMS Scott is especially capable and has proved useful in that role.

HMS Scott's powerful multibeam system is designed to survey large areas of deep ocean floor. The same detailed coverage can reveal devices or other anomalous objects against a mapped seabed. Scott has proved very useful for that work. The answer links routine hydrography to seabed surveillance and the security of undersea infrastructure.