A question for the earth sciences and life sciences gurus. Life on Eath's surface has been almost wiped out several times, such as when we first got oxygen in a gaseous form floofing the atmosphere. Possibly comet bombardments and such as well. I believe fossil records and soil samples indicte we have seen massive extcinctions many times, on the surface. However, it seems to me that deep within the Earth's crust, the environment has probably remained rather constant for the past few billion years. The plates have moved and changed, but over massive timescales. Is it possible that over such a long time, some lifeform may have developed to an advanced, technoly-using species deep in the Earth's crust? If it simply stayed down deep to live off the warmth down there, and looked our world the same way we looked at the inner crust (as in, we've never really investiagted it), could something be down there? PS: Yes, I am considering an idea for a science fiction story. Please Register or Log in to view the hidden image!