I have not seen a UFO or had an encounter higher than the zeroth kind, but I must accept that UFOs are possible. Any reader, please tell me when in official human history did we go to Mars?

In the 1970s a man who used to work for NASA claimed he had a video tape of astronauts exploring Mars and that they found a primitive life form on Mar which burrowed underground. The mad was ridiculed by NASA. Unfortunately I don;t remeber any further details.