ocean floor
ocean bed

Most of the ocean floor is less than 100 million years in age.

The ocean floor at that point is nearly three miles down.

He could make out the ocean floor a long way below him.

At some points I could see the ocean floor - we were that close to the water.

They really did, you know, and not all of it ended up on the ocean floor.

Half the creatures in front of him should have been left on the ocean floor, he thought.

It was over ten thousand feet to the ocean floor.

He'd sink to the ocean floor in under a minute.

"Looking for anything on the ocean floor is very difficult, because you are working blind," he said.

Similar patterns have since been discovered on the ocean floor, 12,000 feet deep.