The Trekkers discover that long-ago Professor Katmandu failed in a mission and thinking he has kept it a secret, vow to find it for him. A dangerous adventure through an underwater cave, protected by a family of guardian crabs, culminates with discovery of the golden conch, only to further discover that the treasure they also find has to be left in place just as Professor Katmandu had done years ago. What they take away is that a seeming failure is in fact a success.