'The clearing' -- a goof? (Possible spoilers.)
After their encounter with the spiders, the men journey on and eventually come to a spot where they stop and look ahead through their binoculars. They see a clearing off in the distance but Galbraith says it's several hours away, so they decide to camp there for the night. (And are then attacked by mutates.)
Jump ahead to the scene where Mories, discovered to be a murderer, flees the tunnel into the open and is cornered and killed by the beasts. The shot of him running into them as they surround him is in the exact same clearing the crewmen had looked at earlier. Check it out.
I assume this is merely a goof -- that the director used shots of the same spot in two separate scenes for economy's sake, not intending that they be taken for the same place. The men appear to go off in a different direction the first time, so they might not be on course for the clearing they saw through the binoculars. On the other hand, it may be that they really were looking at the place that turns out to be just outside the tunnel...in fact, from the angle they're looking at it, the same direction Mories runs out from, they'd almost be standing on top of the underground city when they first spy the site. That's why I doubt the two shots are supposed to be of the same place. But it would have been more intriguing if that's what had been intended.
Of course, mutate-wise, that would have been an even worse spot to camp out than where they stopped that first night!