Bang" On 18 April 1947, British engineers attempted to destroy the abandoned German fortifications on the evacuated island of Heligoland in what became known as the "British Bang". The island had been fortified during the war with a submarine base and airfield. Roughly 4000 tons of surplus World War II ammunition were placed in various locations around the island and set off. A significant portion of the fortifications were destroyed, although some survived. According to Willmore, the energy released was 1.3×1013 J, or about 3.2 kilotons of TNT equivalent. The blast is listed in the Guinness Book of World Records under largest single explosive detonation, although Minor Scale in 1985 was larger (see below). Ocean Liberty in Brest, France On 28 July 1947, the Norwegian cargo ship Ocean Liberty exploded in the French port of Brest. The cargo consisted of 3,300 tonnes of ammonium nitrate in addition to paraffin and petrol. The explosion killed 22 people, hundreds were injured, 4,000–5,000 buildings were damaged. Cádiz Explosion On 18 August 1947, a naval ammunition warehouse containing mostly mines and torpedoes exploded in Cádiz, in southern Spain, for unknown reasons. The explosion of 200 tons of TNT destroyed a large portion of the city. Officially, the explosion killed 150 people; the real death toll is suspected to be higher. General Vatutin cargo ship explosion in Magadan, Russia On 19 December 1947, the Liberty class cargo ship General Vatutin exploded in the Soviet port of Magadan at Nagayeva Bay on the Russian Far East. The ship transported 3,313 tonnes of ammonal and TNT for the mining industry. Another cargo ship Vyborg, carrying 193 tonnes of chemical substances including detonators and fuse cords, also detonated from the explosion. More than 90 people were killed, more than 500 were injured. The explosion caused a tsunami with broken ice, damaging and destroying many buildings. Mitholz, Switzerland In December 1947, a Swiss Army ammunition dump exploded at Mitholz, Switzerland. The explosion of 3,000 tonnes of ammunition killed nine people and destroyed every house in the village. Prüm explosion On 15 July 1949 in the German town of Prüm, an underground bunker inside the hill of Kalvarienberg and used previously by the German Army to store ammunition, but now filled with French Army munitions, caught fire. After a mostly successful evacuation, the 500 tonnes of ammunition in the bunker exploded and destroyed large parts of the town. 12 people