This is one of the advantages of a large group especially when you are the last in line and the long string of lights enables you to actually see the whole outline of the enormous passage. The route to take dependents on what you consider to be the line of least resistance. In places it is definitely easiest to walk along the sandy embankments while in others wading in the smooth bottomed river preferable. But when there are slippery rocks hiding beneath the surface as is more common and there is no flat sandy beach it is necessary to scramble over boulder piles some of which can take you up to 30m above the river level. And as it is an active river last years easy bypass to that cascade may mean that this year you must slide down a large boulder ramp and plunge in to the pool below to carry on as we had to.
Numerous swims are necessary though none is as long as the one in the entrance area.
The largest one stretches at least 100m along one wall and at least 50m vertically up it at the half way point and makes a good spot to stop for a snack, or a full on lunch in our case. Everyone had been worried about freezing before we started but all they could think about after three hours was food. There can't be many cave passages of 5m height and 25m width where you can feel not only a draft but is strong enough to blow out a ceiling burner carbide lamp. Next time we want to take in a kite to see how it flies. The claustrophobic types need not worry for it opens back up again to its more normal dimensions.