One mine was found by the Germans and the chamber was wrecked by a countermine.
From the en.wikipedia.org
They dug a low, narrow and twisting countermine through the rock that eventually broke into the mine itself.
From the en.wikipedia.org
A novel countermine projectile being developed for the US Navy could neutralise mines underwater or underground more effectively, its developers claim.
From the newscientist.com
More examples
(military) a tunnel dug to defeat similar activities by the enemy
Sabotage: destroy property or hinder normal operations; "The Resistance sabotaged railroad operations during the war"
Destroy enemy mines with one's own mines; "We countermined the banks of the river"
Mining or undermining is a siege method which has been used since antiquity against a walled city, fortress, castle or other strongly-held and fortified military position.
(JP 1-02, NATO)- To explode the main charge in a mine by shock of a nearby explosion of another mine or independent explosive charge. The explosion of the main charge may be caused either by sympathetic detonation or through the explosive train and/or firing mechanism of the mine. ...
Sb. 1648. A mine or subterranean excavation made by the defenders of a fortress, to intercept a mine made by the besiegers. v. 1580 to make a countermine.