Mark is a crewperson on a marine-research submarine traveling underneath a large iceberg. An onboard explosion has damaged the ship, and killed and injured several crewmembers. Additionally, it has collapsed the only access corridor between the upper and lower parts of the ship. The upper section, where Mark and most of the others are located, does not have enough oxygen remaining for all of them to survive until the ship is able to reach the surface. Only one remaining crewmember is located in the lower section, where there is enough oxygen.

There is an emergency access hatch between the upper and lower sections of the ship. If released by an emergency switch, it will fall to the deck and allow oxygen to reach the area where Mark and the others are. However, the hatch will crush the crewmember below, since he was knocked unconscious and is lying beneath it. Mark and the rest of the crew are almost out of air though, and they will all die if Mark does not do this.

Should Mark release the hatch and crush the crew member below to save himself and the other crew members?






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