I believe area 51 is just an old top secret base. But I also believe due to all the publicity, if they were working on something like the claims. They would have shut down their test there and moved. Like many others have said, it is probally a cover-up for their many other secret bases. Their is one I know of in West Virginia, the claims say it is an underground community with streets and their own private electric supplies, water supplies...etc...But I also believe that as big as space is their is too much of a chance that life could have evolved similar to the ways it did on earth. It is only probable that if life evolved here under certain conditions, that at first were unsuitable for humans to live but yet produced the amino acids that are the bases of life, that it could happen elsewhere too.