blue water

countable uncountable

The open ocean; deep seas.

Japanese Meaning

広大な大洋 / 深い海

The research vessel drifted for days before we finally sighted the blue water beyond the reef.

調査船は数日間漂流した後、ついに礁の向こうに外洋が見えた。

Sense（1）

The open ocean; deep seas.

After clearing the cape, they still had an hour's sailing to reach blue water.

blue waters

（ plural ）