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The only light source was a circular opening in the ceiling about ten meters above, roughly the size of a manhole cover.,Ou Yangrong remembered seeing a survival video on the internet before, where someone who had fallen into a deep pit used a long rope to tie a heavy object to one end and threw it outside the pit until it got entangled on a tree trunk, successfully rescuing himself.,On his way back, he took a little time to study it and quickly figured out how this small application worked.。