An offshore drilling installation comprising an underwater base spaced from an underwater buoy and in communication therewith by a connecting conduit. The underwater buoy represents the upward extension of the sea bed which serves to support an above-sea platform. The underwater buoy is further secured...http://www.google.de/patents/US4170266?utm_source=gb-gplus-sharePatent US4170266 - Apparatus and method for offshore drilling at great depths
