The tear would lead to unusual regional tectonics, another possible reason for the extreme depth.

His eyes held a piercing quality of extreme depth.

Already the dark blue had gone from the water; now it was much lighter, lacking the near - purple which showed extreme depth.

That's good to know, but I was thinking more about the risks of working at extreme depths.

Another option which has been used for extreme depth is a rebreather bailout set.

If you have been working at extreme depth and then call a halt don't block the holes up.

In this form he was completely at one with the water allowing him to dive to extreme depths and survive.

They seemed to confess to each other the extreme depths of their folly.

Due to its extreme depth, operation of the lock by boat crews is not permitted.

The fact that organisms can be found at this extreme depth is a surprise.