Natural instict there. Humans feel claustrophobic to that extent, plus there's the innate will to discover new things (and places). Speaking of which, one should just reallocate a few billion dollars worth of investments from the various defence projects into the space exploration project instead of milking citizens of their hard earned cash.

But aiyah, most governments are so secretive about all their works with only selective news released. (with the exception of ours )