A scuba diver swims at the USAT Liberty wreck at Tulamben, on the Indonesian resort island of Bali May 14, 2011. USAT Liberty, a U.S. transport ship was torpedoed by a Japanese submarine in January 1942, and was towed to Bali to be salvaged. Subsequently in 1963, when Mount Agung erupted, the tremors caused the ship to slip off the beach, and she now lies on a sand slope in 9.1 to 30m (30 to 100 feet) of water, providing one of the most popular diving sites in Bali. Picture taken May 14, 2011. REUTERS/David Loh (INDONESIA - Tags: ENVIRONMENT TRAVEL)

A scuba diver swims near a school of swirling jacks near the USAT Liberty wreck at Tulamben, on the Indonesian resort island of Bali May 14, 2011. Picture taken May 14, 2011. REUTERS/David Loh (INDONESIA - Tags: ANIMALS ENVIRONMENT IMAGES OF THE DAY TRAVEL)

Scuba divers swim at the USAT Liberty wreck at Tulamben, on the Indonesian resort island of Bali May 14, 2011. USAT Liberty, a U.S. transport ship was torpedoed by a Japanese submarine in January 1942, and was towed to Bali to be salvaged. Subsequently in 1963, when Mount Agung erupted, the tremors caused the ship to slip off the beach, and she now lies on a sand slope in 9.1 to 30m (30 to 100 feet) of water, providing one of the most popular diving sites in Bali. REUTERS/David Loh (INDONESIA) Picture taken May 14, 2011. REUTERS/David Loh (INDONESIA - Tags: TRAVEL ENVIRONMENT)

A scuba diver swims near a school of swirling jacks near the USAT Liberty wreck at Tulamben, on the Indonesian resort island of Bali May 14, 2011. Picture taken May 14, 2011. REUTERS/David Loh (INDONESIA - Tags: ANIMALS TRAVEL ENVIRONMENT IMAGES OF THE DAY)

Scuba divers swim near a school of swirling jacks near the USAT Liberty wreck at Tulamben, on the Indonesian resort island of Bali May 14, 2011. Picture taken May 14, 2011. REUTERS/David Loh (INDONESIA - Tags: ANIMALS ENVIRONMENT TRAVEL)