Trying to get to walkway to cave but there is no hot spot to climb down ladder behind the hut left of the wall with emergency box.
Tried searching previous posts with no luck.
Any help would be appreciated.

This means that you have not seen the picture clue that shows that there is a ladder behind the hut.
Look again at all the papers-pictures at the locked drawer at the bottom of the bed in Drake's room.

Thank you.