The ship quickly sank to the bottom of 'the ocean'.
We've sailed across hundreds of miles of 'ocean'.
There's a storm moving in from 'the ocean'.
(..) I have been told... of a certain sea snake... which has a very unusual method of attracting its prey. It will lie at the bottom of the ocean as if wounded. Then its enemies will approach, and yet it will lie quite still. And then its enemies (..)2000 Gladiator