Rather than taking on water, the city rises to the ocean surface.

One screen showed brilliant light on the ocean surface far above them.

By Thursday afternoon, the piece had been raised to about 200 feet below the ocean surface.

It first emerged from the ocean surface only in 1963.

Even this far below the ocean surface, the human presence on Earth was evident.

"But what method are you going to use to get the stuff two miles up to the ocean surface?"

A bubble lifted on the ocean surface and did not break.

The sun provides the energy to do exactly this at the ocean surface.

But because many never break the ocean surface, only a small percentage are recorded, two scientists say.

They also drop devices that will record similar information on the way down to the ocean surface.