exploded underwater Tuesday as navy divers attempted to defuse it. The Polish navy said the bomb was found last year during preparatory work to deepen a waterway leading to the port of Szczecin in the northwestern part of the country.The 5.4-ton Tallboy bomb was dropped back in April 1945 by Britain's Royal Air Force (RAF) during an attack on the Nazi German battleship Luetzow.As officials dealt with the bomb, more than 750 people were evacuated from outside the town of Świnoujście.Polish navy demolition experts tried to neutralize it under water through remote deflagration, which means burning out its explosives, but it went off in the process.“The deflagration process turned into detonation.