How to pronounce “marianas” in English

The deepest part of the ocean like the Marianas Trench challenger deep.

This is kind of fluff, but there's Marianas Trench there.

So they say things like, we once saw that so-and-so, but they don't mention that's when they were at the bottom of the Marianas Trench,

In his case, it was going the other direction, climbing down Mount Everest, so to speak, to the bottom of Marianas Trench.

We were only about 200 miles from the deepest place the world ocean, Challenger Deep in the Marianas Trench.