Who is the antagonist in Working on the Edge: Surviving in the World's Most Dangerous Profession: King Crab Fishing on Alaska's High Seas by Spike Walker?

The antagonist in the book, Working on the Edge: Surviving in the World's Most Dangerous Profession: King Crab Fishing on Alaska's High Seas, is not a character but rather danger. Dangers faced by crab fishermen include seasickness, broken limbs, hypothermia, and shipwrecks.