AlienWarlord
I would think that the three hollows would need to be reunited in their original universe, if there was any chance of the myth being true. To avoid any drama with people doing tests on his universe-hopping ship, it’s best not to be arrogant and leave it sitting around. Even if it can’t be broken into, do you want people hooking up scientific sensors and things to figure stuff out? If you’re that lazy, just put up a cloaking function.