A First World War German submarine last seen in 1917 has been found by a team of Guernsey specialist divers following a four-year search.Lying in more than 70m of water, the wreck of the UC II Class mine-laying submarine UC-18 and that of which they believe to be the British ship which sank her, HMS Lady Olive, have been located 40 miles west of their historically recorded position of 12 miles south of Guernsey.