Deep Submergence Research Vehicle "SHINKAI6500" is the latest manned research vehicle which can dive to the deepest existing in the world. The maneuverability of a submersible vehicle is highly dependent on its cofiguration. During the development of "SHINKAl6500" we have assumed great importance to its decending and ascending capability. "SHINKAI6500"'s configuration has been improved in various respects reflecting "SHINKAI2000"'s operation results, finally determined based on the results of twice wind tunnel tests and a tank test. In sea trials it is confirmed that hydrodynamics resistance of "SHINKAI6500" is remarkably reduced compared to that of "SHINKAI2000". This paper describes the outline of these model tests, sea trials and the process of the development of its streamlined cofigulation.
