was heard across the estuary as far away as Norwich, Great Yarmouth, and Southend-on-Sea, where domestic windows were blown out and two large plate-glass shop windows shattered. Battle of Jutland On 31 May 1916, three British Grand Fleet battlecruisers were destroyed by cordite deflagrations initiated by armour-piercing shells fired by the Imperial German Navy's High Seas Fleet. At 16:02 was cut in two by deflagration of the forward magazine and sank immediately with all but two of her crew of 1,019. German eyewitness reports and the testimony of modern divers suggest all her magazines exploded. The wreck is now a debris field. At 16:25 was cut in two by detonation of the forward magazine and sank with all but 21 of her crew of 1,283. As the rear section capsized it also exploded. At 18:30 was cut in two by detonation of the midships magazine and sank in 90 seconds with all but six of her crew. 1,026 men died, including Rear Admiral Hood. An armoured cruiser, , was a fourth ship to suffer an explosive deflagration at Jutland with at least 893 men killed. The rear magazine was seen to detonate followed by more explosions as the cordite flash travelled along an ammunition passage beneath her broadside guns. Eyewitness reports suggest that may also have suffered an explosion as she was lost during the night action with 857 dead, all hands. British reports say she was seen to blow up. German reports speak of the ship being overwhelmed at close range and sinking. Finally, during the confused night actions in the early hours of 1 June, the German pre-dreadnought was hit by one, or possibly two, torpedoes from the British destroyer , which detonated one of Pommerns gun magazines. The resulting explosion broke the ship in half and killed the entire crew of 839 men. Mines on the first day of the Somme On the morning of 1 July 1916, a series of 19 mines of varying sizes was blown to start the Battle of the Somme. The explosions constituted what was then the loudest human-made sound in history, and could be heard in London. The largest single charge was the Lochnagar mine south of La Boisselle with of ammonal explosive. The mine created a crater across and deep, with a lip high. The crater is known as Lochnagar Crater after the trench from where the main tunnel was