Mili remains littered with thousands of World War II relics. The law forbids these items from being removed from the island. Mostly what remains are large bunker systems, rail systems, old artillery pieces and remnants of aircraft. Examples include Japanese Mitsubishi A6M Zeros and a North American B-25 Mitchell bomber sitting in just several feet of water. The ground is still covered with craters created by the artillery campaigns that lasted 30 days to "prep" the island for the Allied invasion.