Out of Sky Bubble glitch

This glitch can be performed to get out of the safety zone without having to overload the map and will let you get close to the Guardian Towers of Sandbox. First, place a receiver node outside the Sky Bubble, next, save changes to your map while holding the receiver node. End the game, and re-enter the map and place a sender node anywhere and go through and you should be out there. Note: After this glitch, don't go thinking you can grab the skull from this height because the Guardians will kill you if you go too low.

It is also possible to use this glitch to access sandbox's hidden "fourth layer".