• The Lochnagar mine was the largest of the 17 mines that exploded on 1 July.
  • Debris from the explosion rose some 4,000ft (1,200 metres) into the air.
  • The mine was packed with 60,000lbs (27,216 kilograms) of ammonal in two charges 60ft (18 metres) apart and 52 feet (16 metres) below the surface.
  • The tunnel was 1,030 feet (314M) long. The longest tunnel in chalk during the war.
  • The explosions constituted what was then the loudest man-made sound in history
  • The mine created a crater 300 feet (91 metres) across and 70 feet (21 metres) deep, including a lip 15 feet (4.6 metres) high.
  • It obliterated between 300 (91 metres) and 400 feet (122 metres) of the German dug-outs which are thought to have been full of German troops,
  • The mine was blown at 7.28 on the morning of 1 July.
  • Cecil Lewis, then an officer in the Royal Flying Corps, witnessed the explosion of the mine from his aircraft high above La Boisselle and is quoted as saying:
    "The whole earth heaved and flared, a tremendous and magnificent column rose up into the sky. There was an ear-splitting roar, drowning all the guns, flinging the machine sideways in the repercussing air. The earth column rose higher and higher to almost 4,000 feet." (1,220 metres)
  • The sector was attacked by the 34th Division, a New Army Division consisting of Tyneside Irish Tyneside Scottish, Lincolnshire, Suffolk and Royal Scots, battalions.
  • The Division lost 6,380 officers and men that day, and was the hardest-hit British division
  • The Crater receives around 200,000 visitors a year and is thus one of the most visited sites on the Western Front.

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