Bunker „Wyrwidąb” was built in June-July 1939. Heavy, concrete combat bunker „D” type, target armaments – 3 machine guns „Browning”. Armored combat-observation dome has not been installed, lack of equipment, ventilation, water instalation and electricity. „Wyrwidąb” has one emergency escape, two rocket launchers, grenade dumps and shooter. Bunker was not active during the battles in September 1939, was blown up during the training of battalion „Bielsko” in 1968.