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Top view of the re-entry cone used by the Deep Sea Drilling Project as a means of re-entering holes on the sea floor previously drilled by the Project's research ship the D/V Glomar Challenger (ship), a member of the Leg 79 crew stands by the cone as a size reference. 1981.

Top view of the re-entry cone used by the Deep Sea Drilling Project as a means of re-entering holes on the sea floor previ...