In late October 2000 the University of Tokyo launched their R-one AUV Robot which operates completely autonomous. The AUV is equipped with the Klein AUV System 2000 side scan sonar. The R-one Robot provides a very stable platform for the side scan sonar as well as maintaining a very precise altitude above the sea floor.
At present, the University of Tokyo is evaluating the R-one Robot for use in observing and monitoring semi-active under water volcanoes.
Below are data images of an under water volcano known as "The Teisi" located at 34:59.4N, 139:08.0E. This volcano last erupted with an explosion in 1989. The depth is estimated to be 122 meters.