Montreal Crater and its sign at Vimy Ridge, 1917. There appears to be skulls in front of the sign. It was named by the 14th Battalion, The Royal Montreal Regiment in 1916. From the attached article: "In the fall of 1916, German tunnelers were discovered digging towards a section of the Canadian line at Vimy. A counter-tunneling operation was undertaken by British engineers with the aim of detonating a mine under the German galleries before they could explode theirs under the Canadians. The counter-tunnel was packed with nearly 24 tonnes of explosives and detonated on Nov. 27 at precisely 9:50 p.m. A diary kept by the 14th Battalion (RMR) from Montreal, which was positioned in front of the new crater and tasked with its consolidation, estimated its size at 67-metres wide at its widest point and 18-metres deep. Moments after the mine was detonated with a massive, earth-shuddering thud, distress flares shot up from the crumpled German lines, a sign for their artillery to respond. The German guns answered with an intense, half-hour barrage of the RMR's position. Amid the shelling, four 30-man storming parties under the overall command of 14th Battalion Capt. A.T. Powell raced into the smouldering, exploding void with orders to consolidate the near lip "with the greatest possible speed." As if the German shelling wasn't enough to contend with, a counter-barrage by Canadian and British guns fell short, causing "many casualties" among the 14th's storming parties, the battalion diary noted."