Mark is a worker/emplyee of a food company. That day, he was checking some stored goods in the cold storage/freezer. At the end of the day, when he was meant to go home, he tried to open the door in order to go home, but was shocked to find, the door was broken! He couldn't open in any way and no matter how many times he rang the alarm, no one answered...imagine spending a night somewhere at a temperature of -20 degrees, he gave up hope/he was in despair...
The next day, when his colleagues came to work, they found Mark frozen stiff in the freezer/cold storage, what they couldn't understand was: how did he freeze to death? There was a power cut all evening yesterday... but even if no one heard his alarm, it shouldn't have resulted in him freezing to death.