What about my second question, why do you suppose no one thought to seal themselves in the other stations to protect themselves from the Purge and the Others. Obviously they wouldn't be able to stay sealed indefinatley but they could assumedly stay sealed up enough to try and contact the outside world. We do know that there was a protocol for such an event in the Flame station. All it would've taken was for one Dharma worker to seal themselves in the Flame and get word outside.