Subway

This has to have been done before, but I don't see it on MP. Any of the regulars know what it is called?

There is a long low boulder leaning against the Stone Tower Boulder, which forms a low tunnel with a sort of roof crack at the top. Hand traverse the crack while heel hooking and foot jamming the roof. Reach for crimps when the crack runs out, and then work up to the jugs above.

I don't really know how bouldering grades work. V2?