Actually, in reality, humans can withstand extremely high G forces, but only for a short amount of time, in 1967, an american test team put a man on a rocket sled, which accelerated to over 500mph in less than 1 second, the man went through 35 positive G's for that time and survived to tell the tale, although nearly all of his organs were ruptured, his eyes blood shot, and he never walked properly again. But he still survived it. [:)]