Noticed this in the local weekly freebie: "An oceanographic survey company from Plymouth has discovered what is thought to be the wreck of a World War I submarine in the Western Approaches. GEOSA, based in Oreston, was helping to test a new seabed mapping sonar system when the mystery wreck appeared on-screen, lying in 90 metres of water. Managing director Captain Nigel Boston said it appeared the submarine had struck a mine. "It could be a German U-Boat, but looking at the faint shadow of the conning tower and casing form, it might be a version of the British "K Boat", some of which simply disappeared without trace." Any historians got any thoughts about its identity ?