How to pronounce “undersea”(adj) in English

Like undersea molten lava forming a new island, a piece of time detaching from the sea floor and floating up to the surface.

What makes you more nervous, actually public speaking or exploring the undersea world?

I lived on the bottom of the ocean for three weeks in Aquarius, the only undersea laboratory.

Then I'm going to back up a little bit and go back into the undersea realm and start with this family tree of vehicles which comes out

And then you can add to that engineers, undersea explorers,

The things sitting on the bottom that were supposed to listen for undersea earthquakes and movement along the Pacific