http://www.lochnagarcrater.org/
"Twin charges, of 36,000 lbs (16,300 kilograms) and 24,000 lbs (10,886 kilograms) of ammonal, had been placed in two chambers at 60 feet (18 metres) apart. Captain James Young of the 179th Tunnelling Company. Royal Engineers, pressed the switches and observed that the firing had been successful. Captain Young had blown the mine crater of La Boisselle, the biggest of the Great War, a single, vast, smooth sided, flat bottom chasm measuring some 220 feet (67 metres) diameter excluding the lip, and 450 feet (137 metres) across the full extent of the lip. It had obliterated between 300 and 400 feet (91 and 122 metres) of the German dug-outs, all said to have been full of German troops."
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