When I was a kid Superman’s “fortress of solitude” was a big ice cave somewhere up north with a large yellow door that he had to open with a giant key. Supposedly the idea was that only Superman was strong enough to be able to use the key, but I always wondered why he needed a door and a key in the first place. Why not just place a really big, heavy object in the way that only Superman could move in the first place?
That’s the idea behind Roid Rage’s hiding place. It’s just hidden under a big block of concrete that he thinks only he can move. Of course, if he forgets to seal it back up again, it doesn’t do him any good at all. Maybe that was the point behind Superman’s giant key and door – he was more likely to remember to close it up when he left….