By March 20, 2009, activity had slowed at the site of the undersea eruption in the Tonga Islands.
Atmosphere Water Volcanoes
The submarine eruption in the Tonga Islands remained visible late in the day on March 18, 2009.
On March 18, 2009, the Tonga Islands submarine eruption appeared as a blue-green blur under the water. A pumice raft floated on the nearby ocean surface.
Land Water Volcanoes