His instinct was Dave's greatest weapon at that moment. Following his instinct, he began moving forward even though he had no idea what lay in wait for him. He walked in a straight line hoping to bump into another door, and perhaps find the light again. His sense organs were so sensitive as he navigated through the darkness.

Suddenly, one of his feet struck a door gently. He moved his hands forward for further probing. When he was sure that it was another path, he began searching for the keyhole using his hands and his senses.

He did find the keyhole after about two minutes. He did what he knew...