The West Mata volcano was discovered in May 2009 nearly 4,000 feet below the surface of the Pacific Ocean, in an area bounded by Fiji, Tonga and Samoa. It is the deepest erupting volcano discovered to date. In this image, bands of glowing magma, about 2,200 degrees Fahrenheit, are exposed as a pillow lava tube extrudes down slope. Image is about three feet across in an eruptive area about 100 yards that runs along the summit of the volcano.