"Right you are."
On they went, into the valley which Bob had traversed, and then up the line of hills where they had shot the goats just after coming ashore.
But now they found themselves confronted by a deep ravine, partly choked with brush and vines.
"How are we going to get across that, Dave!"
"We'll have to walk along the bank until we reach some crossing-place," answered the young diver. "I am not going to risk a tumble by taking a leap."
"Nor I. I have had tumbles enough to last me a lifetime," and the young engineer shook his head dubiously.
On they went, the way growing more perilous every moment. They were at the edge of a forest, and the top of the ravine was lined with loose rocks.
Suddenly Bob, having made a leap from one rock to another, went down in a heap and gave a loud cry of pain.
"My foot! My foot!"
"What's the matter?"