Boundary Route - Big Room to Outer Limits
This route is the longer entrance to entrance route. The route has lots of crawling and a bit of interesting climbing. This route uses both the White and the Green routes to make the loop so one should be familiar with these two routes before trying this route. This route is the most committing with the highest chance of getting seriously lost.
The pink flagging starts by traversing the flat bottom of the Big Room (White #11) to the north. This passage will quickly turn into a crawl and the pink flagging (Pink #1) will begin. The route will follow a long series of small traverses and climbs. Use caution, since the flagging can be a bit hard to follow through this highly-mazy section of the cave. When successfully followed, you will pop out into the long low Raceway passage (Pink #18-20).
The end of this passage continues up and up. A crack in the floor allows visitors in the Lunch Room to be heard below. From Pink #23 a short-tight 10-inch pitch leads into Lunch Room Junction (Green #13) and the Green Route.
Continuing up following the flagging on the normal route, the Hub (Green #6) is reached and the green route can be followed south to the North Entrance (Green #0).