What do you feel area 51 contain?

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If i got a power of invisible, then the first place i would like to visit will be area51. There are lot of rumors about area51 and also we have so many explanations and photography like from simple aircraft testing to alien fleet & UNO links. But not one of them is proved or agreed. So now we'll take this topic for discussion and see what people think about it and what most of the people like to go with in this subject. The think i feel was that there may be some extra-terrestrial life may kept under protection and also some crazy is going on it, which common people and even some nations don't know. The area is protected by radars and had a tight security sothat no person can enter inside.Even if you are invisible radar can so your presence.The area is even restricted for some military disiplinarys. Some feel that it is a base for finding and checking new and advanced aircraft but still there is a doubt that some crashed alien flight with live/dead aliens are researched there under protection. Heavy fine and punishment were given to those who enter that area and taking photograps,but still matter goes under suspense. i'll live in yopur hand to discuss........