How can I fly in the Caves to skip them?

If you press Z on your keyboard while in The Caves it allows you to fly and clip through walls to get out of bounds. Pretty simple with trial and error to figure out a setup that works for you. The hard part is getting a consistent setup for hitting the invisible load trigger. It's easier to do while playing with director's commentary turned on since there is a text box you can use to help orientate yourself somewhat in the void.