WW2 bomb explodes during attempt to defuse it The largest unexploded World War Two bomb ever found in Poland has detonated during an attempt to defuse it. The RAF dropped the Tallboy or "earthquake" bomb in a raid in 1945 which sank the German cruiser Lützow. The Polish Navy said there had been a 50:50 chance the bomb would explode and all the divers were unharmed. The bomb was at the bottom of a Baltic Sea shipping canal, and about 750 residents near the port city of Swinoujscie were evacuated. Swinoujscie was part of Germany and called Swinemünde at the time of the bombardment. The shock of the latest detonation was reportedly felt in parts of the city and a video shows the blast throwing up a large column of water into the air. The bomb was 6m (19ft) long and weighed 5.4 tonnes, nearly half of which was its explosives. The bomb was embedded at a depth of 12m and only its nose was sticking out.