The two pictures are screenshots taken from a FPS game.

When I came to this, one of the marines beside me said to me, "That’s the ridge through there. We’ll buy you as much time as we can. See you at the victory parade, Sergeant."

Does he mean that you need to creep under the rock and get to the ridge, or the ridge is the rock ahead and you'll have to creep through it?

Why not say "There’s the ridge through there"? It seems clearer.