How to escape from bunker in trailer?

[Sir_Named]

I've gone there multiple times, and don't know how to escape except with Pathfinder.

I heard there's a button, but I didn't see one at all. 

[Alphabets · Accepted solution]

@Sir_Named there is a green button (kinda like the ones in charge towers or on the train) on the wall in one of the narrow pathways, when you press it, another hole will be opened above and you will see a rope appeared right on top of that green key.

[Alphabets · Accepted solution]

@Sir_Named there is a green button (kinda like the ones in charge towers or on the train) on the wall in one of the narrow pathways, when you press it, another hole will be opened above and you will see a rope appeared right on top of that green key.