After pulling steadily for four hours, stopping only once to refresh themselves, they came in sight of the entrance, and saw daylight beyond.

A feeling of joy now came over the men, and three hearty cheers were given that echoed curiously through the arches overhead.

Still there was another and serious obstacle to contend with.

A boar, or tidal wave, had made at the entrance, and was rushing in with a roaring noise and such force that the boat could not have stemmed it for a minute.

It was therefore, necessary to seek safety behind some high rocks on one side of the entrance, and wait a change in the tide.