So I've been checkign the challenges I have to complete and there's one that puzzles me:

"Outer Space
Dared to venture beyond Big MT's perimeter... more than once !"

So wath is it? is there any broken fences so we can go past or what?

thx in advance.
edit: nvm, got it, you just need to run past the fences until you get warped back to the Sink, I kinda hoped for some external secret area...