 Ehime Maru and USS Greeneville collision

On 9 February 2001, about south of Oahu, Hawaii in the Pacific Ocean, the United States Navy (USN) USS "Greeneville" (SSN-772) collided with the Japanese-fishery high-school training ship "Ehime Maru" (えひめ丸) from Ehime Prefecture.In a demonstration for some VIP civilian visitors, "Greeneville" performed an emergency ballast blow surfacing maneuver.