Tarzan had led two men, Johannes Niels and Merkus to a nearby volcano containing a diamond mine and in return, they would give him one of the diamonds to give to Jane, only for them to turn on him once inside, wanting to take all the diamonds for themselves.
Tarzan led two men, Johannes Niels and Merkus, to a volcano with a diamond mine in it. In exchange, they promised him one of the diamonds to give to Jane. However, once inside, the men betrayed Tarzan, wanting all the diamonds for themselves.