This 3D fly-through movie shows the seafloor at Explorer Ridge as mapped by the EM300 sonar system on board the R/V Thompson. Cool colors are deepest (3400 m), and warm colors are shallowest (1600 m). The EM300 was used to map an area of 100 km by 50 km at a resolution of 35 m. The location of the Magic Mountain Hydrothermal vent site, where the more detailed surveys were made, is shown. (Movie courtesy of Clay Hamilton and Bill Chadwick.) Download largest version (mp4, 5.2 MB).