LOL, I'm sure if he called the map "gero" it will have atleast an entrance to the lab -_- trust me, I've tried to bust that open, lol and grega has proof, so yeah, maybe the esf team or the mappers should just make a secret place in each map EXTREMELY hard to find that reveals info into the next version or something super cool!
But that's too late now, since 1.3 is PROBABLY the last, but it would be cool, like there's a button somewhere in the corner of the map, but it just opens a small opening on the total other side of the map, but pretty dificult to notice, just a sound to say that it did something when you pressed the button, oh and you have a time limit to get into the opening, otherwise you have to try again ^^.