[libstripper]

Its sinking is a mystery because it completed its mission and then apparently displayed the blue light to the shore indicating the mission succeeded. Then it sank. Nobody knows if it was due to some kind of enemy action, a defect in the sub, or a fatal error by the crew.

[PistolPaknMama]

SC ping!

[supercat]

Its sinking is a mystery because it completed its mission and then apparently displayed the blue light to the shore indicating the mission succeeded. Then it sank. Nobody knows if it was due to some kind of enemy action, a defect in the sub, or a fatal error by the crew.

Did the sub start exchanging air with the surface and continue to do so after it showed the blue light? From what I've read, the boat was illuminated by a candle which was also used to judge oxygen levels. It would be quite possible for oxygen levels to remain sufficient for combustion and yet for CO2 levels to be toxic.