3 And the second poured out his bowl into the sea, and it became blood, as of one dead; and every living soul that was in the sea died.
Revelation 16:3 Cross References - BLB
Revelation 8:8-9
Revelation 10:2
2 and having in his hand a little scroll being open. And he placed his right foot upon the sea, and the left upon the earth.
Revelation 11:6
6 These have the power to shut the sky, so that no rain shall fall in the days of their prophecy; and they have power over the waters, to turn them into blood, and to strike the earth with every plague, as often as they might desire.
Revelation 13:1
1 And I saw rising out of the sea a beast, having ten horns, and seven heads, and on its horns, ten diadems, and upon its heads, names of blasphemy.