Sharks Are a Regular Occurrence
Walker encountered a shark in the Tsugaru Channel in Japan. To make things worse, the current was picking up, and he had to sprint for 11 hours against 12-foot waves. Outswimming a shark wasn't even the worst thing he'd ever done, though...
Subzero Temperatures
The waters between Ireland and Scotland in the North Channel are notoriously the most difficult in the world. He knew that he'd be in for the test of a lifetime if he took on this challenge. Along with freezing temperatures, Walker also had to face off against a wall of lion's mane jellyfish...
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