The movie is about a group of forced laborers in Poland who take shelter inside a fortified German supply bunker during an Allied air raid. The bombardment seals shut the only exit and the rubble hides the bunker. The group is forced to survive inside the bunker for 6 years, the last 4 years in total darkness.
Has there been any definite proof this supposed historical event actually happened?
I read there was a Time Magazine article about it but could not find it. The articles I did find contradicted one another and did not answer the question.