The Spanish-American War-era battleship USS Massachusetts was stripped of her guns and furnishings and towed to Pensacola in 1921. The obsolete battleship was then used as a target for experimental artillery after being scuttled just outside the entrance to the bay. Today, USS Massachusetts serves as a giant artificial reef where almost every type of Gulf marine life can be observed. A virtual tour and detailed information can be found here: http://www.museumsinthesea.com/massachusetts/index.htm