Jacques Cousteau's milieu (3)
I believe the answer is:
sea
(Other definitions for sea that I've seen before include "70% of the earth's surface" , "Great expanse of water" , "North for one" , "Cause of flooding" , "Division of an ocean" .)
I believe the answer is:
sea
(Other definitions for sea that I've seen before include "70% of the earth's surface" , "Great expanse of water" , "North for one" , "Cause of flooding" , "Division of an ocean" .)