Scientists have finished their first 3D scan of an underwater volcano located 300 miles off the coast of Oregon with a base the size of Austin and a main magma reservoir approximately two-thirds of the length of Manhattan.

Dubbed Axial Seamount, the “deep-sea magma monster” is the youngest in the Cobb-Eickelberg seamount chain, a 1,120-mile-long line of submarine volcanoes created by a stationary mantle plume below the shifting Pacific tectonic plate.