In very high water the beck crossing at the cave entrance looks like something you shouldn't be getting in.
If you get through that and you enter the cave, you descend a boulder slope, and then have the choice of a high route on the left on a shelf or a lower level route on the right. In flood the right side can be a swim, normally it is welly or knee deep. If it's a swim I'd be turning back with beginners!
For extra fun, don't miss out on gloop de loop, best done as a climb up the far end, before enjoying the crawling. You will get a bit damp, but have taken plenty of beginners through. Beginners might want a rope or a close spot near the top of the climb up, there are a couple of bolts to rig something off up there.