Robots to Replace Submariners in UK Navy: THE submarine, which reaches a century of service with the Navy this week, will be replaced by a new generation of underwater weapons as part of a radical shake-up of sea warfare planned by defence chiefs. Senior officers are examining a range of remote-controlled underwater robots that will revolutionise the force known as the "silent service". Manned submarines are expected to be used for command and transport roles rather than fighting sea battles, according to Ministry of Defence plans for the future of the Navy in the 21st century.