... is out in space, completely surrounded by a hard vacuum, any accident is very likely to be fatal. On Earth, if a man sticks his thumb in a punch press, he loses his thumb. Out here, if a man's thumb is crushed off while he's in space, he loses his air and his life long before he can bleed to death. Anything that disables a man in space is deadly ninety-nine ... — Anchorite • Randall Garrett