3 Then the second angel poured out his bowl on the sea, and it turned into blood, like a dead person’s; so every living soul in the sea died.
Revelation 16:3 Cross References - WPNT
Revelation 8:8-9
Revelation 10:2
2 and he had a little book open in his hand. He placed his right foot on the sea and his left on the land,
Revelation 11:6
6 They have authority to shut up the sky so that no rain falls during the days of their prophecy; and they have authority over the waters to turn them into blood, and to strike the earth with every plague, as often as they wish.
Revelation 13:1
1 Now I was standing on the seashore, and I saw a Beast of prey coming up out of the sea, having seven heads and ten horns, and on his horns ten diadems and on his heads blasphemous names.