As you can see in the image below, though totally overlooked by just about all ufologist. It seems to me to be one of the most mysterious of all the mars images that have been released. Notice all the digital mucking! Why would nasa do this? To obviously digitally muck the opening of the extremely large holes?
When I say "hints" I mean in the left giant hole, there is what seems to be a track at the bottom of the entrance. And the right hole has a most accentuated obfuscation I've ever seen! It looks a (digitally mucked) liquid is splashing out of it but yet a barrier is underneath and it is flowing over it. Could this be hints of a martian entrance and exit for their space craft, mother ships etc? That is if you believe there could be life under the planet or should I dare say a martian civilization.