Raynon is an alternative entry to Claustral Canyon via Mistake Ravine. It joins Claustral Brook just after the Black Hole of Calcutta via its own set of 6 abseils. We then follow down Claustral Brook to the usual Claustral exit.
This route is not often done and has some tricky sections, so is for experienced canyoners only. Wetsuits will be required and there is a fairly long walk out.