Coffin Crack

Start by crawling as far into the small cave as possible. You can start head first or feet first (doesn't really change the grade). If going feet first, use some OW trickery to turn around and invert. If going head first, make a couple of hard moves and then stem your way up. Either way, the crux is keeping your back off the ground.

The tiny cave between the two boulders.

Maybe a blanket or small piece of carpet?