That's You looking up down there

During the last two years oceanographers of Columbia University and the U.S. Geological Survey, have measured the distribution of radioactive substances, particularly radiocarbon and tritium, in the deep ocean, in an attempt to trace thepaths of motion and the mixing of the waters. They found that the radiocarbon “age” of the deep water averages about 500 years and the deep layers seem to be thoroughly mixed ...

... Measurements by the British research vessel Discovery, and the Atlantis of the Woods Hole Institution, have shown the existence of a current of about half a knot of 2,000 meters depth, almost directly under the Gulf Stream and flowing in exactly the opposite direction, that is, to the southward.

-- Collier’s Encyclopeida Yearbook 1958, “Oceeanography”