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.
She swam away and down to the ocean bed with him, laughing.
Surely they must be well below the ocean bed now.
They had to return to the ocean bed as quickly as possible.
He saw the first charge plunge into the water on his right and fall towards the ocean bed.
Reaching bottom, he prowled about the ocean bed for a while, then started up again.
Once more the Advance settled to the ocean bed, near the wreck.
Only in the last century scientists were saying that there could be no life at all on the ocean bed.
The earthquake killed some, and the rest died for want of water after the ocean bed rose to the air.
Once, this must have been a lake or an ocean bed.
We have planted them in different spots on the ocean bed.
