A tunnel to life?

From the latest mars photo's. Everyone hasn't really noticed there is a tunnel or an opening to a tunnel. Has arch entrance!



Look its a path that leads into a tunnel. I wonder what is inside of the tunnel.

Are you gonna go find out?
Even if someone did go in, if it is indeed the entrance to a tunnel (that would be pretty interresting. Is it near the mars face? I once saw a rock formation naturally like a face, real creepy, in a closed down campsite. IT was a huge thing, too, not something carned out of limestone.) anyway thoughm even if someone did go in, wouldn't you figure someone would already have been there, or some little green guy would pop out and shoe you out?