Despite its home in landlocked Switzerland, Oris is well known for its link diving watches and has created an impressive lineage of limited editions devoted to raising awareness, and funds, for aquatic causes, from the Rhine River, to Lake Baikal, to the Great Barrier Reef. The latest one, released this week, is the Carysfort Reef Limited Edition, based on the Oris Aquis GMT, and it might be their most impressive to date.