 FAIR: When the expedition first reaches the hidden pyramid, one of  the characters examines the wall markings after rubbing away the  cobwebs from the stone. Are there any spiders that thrive 2000 feet  below sea level in Antarctica?  Spiders and other arachnids have been known to survive in extremely  hostile environments, including at high altitudes, in climates of  intense cold and where food supply appears to be scarce. The climate  inside the pyramid was warm enough that the humans breath did not  condense. Other survival factors may have been present. Also, the  material may have not been spider webs, but strings of dust and  particles accumulated over time.