(Airs Sunday, May 30) Along her 9,000-mile voyage to nest, our loggerhead tour guide encounters hammerhead sharks, deep ocean tempests, and fishing nets.

Venturing across thousands of miles of open ocean, the loggerhead performs one of the most remarkable feats of orientation and navigation in the animal kingdom.

Research on sea turtle navigation began with acclaimed zoologist Archie Carr in the 1950s.