If he returned to the Explorer it would avail nothing, for the boat could not be left alone to allow of Pomp’s returning to his assistance.

It was a terrible position.

Frank made sure of the stability of the orifice, and then lying flat upon his stomach shouted:

“Barney! Where are you? If you are alive and can hear me, answer!”

But no answer came back.

All was the stillness of the tomb.

Once Frank fancied that he heard a faint halloo. But he was not sure of it.

The young explorer arose to his feet sick and faint.

A groan escaped his lips.

“Well,” he muttered, regretfully, “Barney is gone. Poor fellow! He was a faithful servant and I feel his loss much.”