There’s a radioactive time bomb in the Pacific Ocean

The concrete cap of a tomb encasing radioactive fallout now has cracks, and what’s beneath can rise from the dead. The U.S. military, in 1958, conducted a nuclear test on Runit Island in the Marshall Islands with an 18-kiloton bomb called Cactus. The resulting blast left behind an almost 33-foot deep crater, which later became a dumping ground for the debris from a myriad of nuclear tests between the 1940s and 50s. In 1977, the Runit Dome was created to contain that radioactive waste. The dome's...