Climb 20 or so feet up(this is the R section) to a ledge above a tree to clip the first bolt. From here continue up past 3 more bolts to another good ledge. Clip the last bolt and move over a slight bulge on good cobbles a 2 bolt anchor.
There are not any chains or rap rings. Walk off on 3 class terrain to the opposite side of the tunnel.
The left most route in the small gulley on the North side of the tunnel on the Tunnel Trail.
2 bolt anchor
Jim clipping the last bolt.
Martha halfway up enjoying the scenery.