The second angel blew his trumpet, and something like a great mountain ablaze with fire was hurled into the sea. So a third of the sea became blood,
Revelation 8:8 In-Context
Then the seven angels who had the seven trumpets prepared to sound them.
The first angel sounded his trumpet, and there came hail and fire mixed with blood, and it was hurled down on the earth. A third of the earth was burned up, a third of the trees were burned up, and all the green grass was burned up.
The second angel sounded his trumpet, and something like a huge mountain, all ablaze, was thrown into the sea. A third of the sea turned into blood,
a third of the living creatures in the sea died, and a third of the ships were destroyed.
The third angel sounded his trumpet, and a great star, blazing like a torch, fell from the sky on a third of the rivers and on the springs of water—