Crick and Stone: Over the Waterfall

Crick and Prof. Stone (who is trapped inside a rock) go for an outing with the Warthogs, drifting down the Babbling Brook.The ride is very relaxing- until their raft takes them over the waterfall and they plunge into Bubble Lake! Crick and Prof. Stone/the rock plunge to the bottom of the lake! The group discover a mysterious tunnel!