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CORONADO, Calif. — Twin brothers are just two days from completing a paddle board journey from Alaska to Mexico.

Casey and Ryan Higginbotham have been averaging 20 miles every day as they traverse the edge of North America.

The 24-year-old brothers decided to put their lifeguard jobs on hold to paddle for seven months, completing a task never attempted.

“We’ve seen black bears… and once I was just about a quarter mile from a river mouth in Oregon and the board gets lifted up and I just see this body passing under me,” said Casey Higginbotham.

It was a great white shark, and one of just many encounters with the monster predators.

Now, the brothers are resting up for their last leg of the epic journey that will finish in Imperial Beach Friday on the border of the US and Mexico.