More than 13,000 shipwrecks from the Second World War lie scattered across the Pacific seabed, sunk during battles between Japan and the United States and left where they fell for eight decades. This 101 East report examines what is still inside them: oil bunkers, munitions, and other hazardous cargo sealed inside hulls that have spent decades rusting in seawater. The film follows officials and researchers tracking how corrosion is weakening those hulls, with some wrecks already leaking toxic substances into the Sea of Japan, damaging local fishing grounds and raising health concerns in nearby communities. It weighs the scale of the problem, thousands of vessels scattered across a vast ocean, against the cost and difficulty of doing anything about it, from full removal operations to marine protected zones to underwater drones fitted with sensors to catch leaks early. The report treats the wrecks as more than historical wreckage, framing them as an environmental liability that governments have been slow to confront while the metal keeps thinning.