Russia's nuclear missile bunkers reportedly come standard-issue with a sledgehammer whose designated purpose is smashing open the safe containing the launch-codes, should the combination not work:
The sledgehammer's existence first came to light in 1980, when a group of inspecting officers from the General Staff visiting Strategic Missile Forces headquarters asked General Georgy Novikov what he would do if he received a missile launch order but the safe containing the launch codes failed to open.
Novikov said he would “knock off the safe’s lock with the sledgehammer” he kept nearby, the spokesman said.
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