Collocations for ocean - noun

deep | vast | great
exploring the depths of the three great oceans

open
A storm started up once we got out into the open ocean.

tropical, warm | southern
penguins of the southern oceans

cross, sail | explore

depths
the darkness of the ocean depths

surface | bed, floor | basin | water | wave
a life on the ocean wave (= at sea)

current | voyage | liner

across the ~
trade across the Atlantic Ocean

in the ~
Various toxic substances have been dumped in the ocean.

the bottom/depths/middle/surface of the ocean, the oceans of the world
great ships that sailed the oceans of the world