 Theres a shot where the heroine pulls herself up a cliff. Its  filmed exactly like the shot in _Alien (1979)_ (qv) where Ripley  (Sigourney Weaver (qv)) does the same, looking for the Alien, and  in _Aliens (1986)_ (qv), when Ripley pulls herself out of the  airlock at the end. In both shots the characters are sweating  heavily and one of their hands in front of their faces can be seen.