Crossword Genius

Challenger ___ (lowest known point in the earth's oceans)

Ross

I believe the answer is:

deep

(Other definitions for deep that I've seen before include "Wise - difficult to understand" , "Heartfelt" , "Intense -- extreme" , "profoundly" , "Profound - cunning - sea - bass" .)

I've seen this clue in The New York Times.
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