A volcanic eruption of superheated magma (some 2,200 degrees Fahrenheit) from the West Mata Volcano produces a bright flash of hot magma that is blown up into the water before settling back to the seafloor. The explosion throws ash and rock into the water, and molten lava glows below. This volcano is in the Pacific Ocean near Fiji. Its top is nearly a mile below the ocean surface (1165 meters / 3882 feet) and its base descends to nearly two miles (3000 meters / 9842 feet) deep. Watch a video of submarine volcanoes erupting.