But I really wanted to post a link to a very interesting site at MIT concerning Maritime Archeology.
15,000 years and before that, so much of earth's water was locked up in ice that the sea level was 400 feet or more BELOW present day's sea level. The ruins of cities have already been found off of both coasts of India at depths that would have been dry land 20,000 years ago, stone pyrmids just off the coast Japan (Okinawa) and I wouldn't be surprised if there weren't cities out in the bottom of the Caribean or out in the mid Atalantic.
The human brain is great at discerning patterns where none exist.
If there *are* remains from an intelligent civilization on Mars, and if NASA know this, then why aren't they hyping it and using this golden opportunity to raise money for a manned Mars mission?
Why? Because there are no ruins to be explored, simply average photos of boring rock formations in which some misguided individuals see "ruins."
Real science is so much more interesting than these hoaxes, anyway! We may yet find evidence of past life on Mars, but it'll be at the microscopic level.