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The film's use of the underground cave system as a setting is also symbolic. The caves represent a primal, ancient environment, where the rules of the surface world do not apply. The Crawlers, which inhabit the caves, are a manifestation of the fear and the unknown, and serve as a symbol of the dangers that lurk in the darkness.

The string "h264aac" refers to the compression standards that defined that era of digital media: descent20071080pblurayh264aac