Windmill + Acetone + Celluloid + Firing Pin

S4, E4: Windmill + Acetone + Celluloid + Firing Pin

Available on iTunes, CBS ALL ACCESS, Prime Video, CBS All Access
As MacGyver works quickly to rescue survivors from a collapsed building in Germany, he discovers a new safety threat - a 1,000-pound undetonated bomb from World War II hidden beneath the rubble.