In a ghostly reminder of the Bay Area's nuclear heritage, scientists announced Thursday they have captured the first clear images of a radioactivity-polluted World War II aircraft carrier that rests on the ocean floor 30 miles off the coast of Half Moon Bay. The USS Independence saw combat at Wake Island and other decisive battles against Japan in 1944 and 1945 and was later blasted with radiation in two South Pacific nuclear tests. The Navy deliberately sank the contaminated ship in 1951 south of the Farallon Islands. The rediscovery of the USS Independence offers a fascinating glimpse into American military history and raises old questions about the safety of the Farallon Islands Radioactive Waste Dump ... where the federal government dumped nearly 48,000 barrels of low-level radioactive waste between 1946 and 1970. The Independence was sunk on Jan. 26, 1951, and came to rest 2,600 feet below the ocean surface. The Navy withheld the location of the wreck for decades, but the U.S. Geological Survey found its likely resting place while mapping the sea floor in 1990. Retired judge and state legislator Quentin Kopp, who many years ago demanded research into the Navy's disposal of radioactive material off Northern California before 1970, said Thursday that the question of whether the waste posed a risk to humans and wildlife was never resolved.