Few people know two historical and/or archaeological shipwrecks at Tokyo bay. One is Haya-maru located at the southern-side of line drawn between Futtsu Cape at Chiba Pref. and Kannonsaki at Kanagawa pref., the other is the Oneida located at the northern-side of the line. While the former is a national vessel, the latter is a foreign warship (United States). Sinking at internal waters (territorial