Was the noise not something to do with the room you must not enter... They probably rigged up some speakers or something around the forest for effect

A bit weak was how the lack of human intervention was just explained away by a "government payoff" - surely stray planes etc... must have flown overhead, even if by accident.
Also, would the girl not have heard the bloke drive off in his truck? She will not have heard an engine before this, so surely she would ask questions? Maybe I am missing something
