Rookie caver, Kevin, leads an expedition into the depths of a Tennessee cave. Three hopeful rookies compete for a high-flying position with the Sonoma Marin Tree Men. A novice flyer travels to Africa to be take a rigorous bush pilot course.

A rookie tree climber jeopardizes his team when he ignores expert advice about scaling a redwood. Dan and Erik attempt a dangerous underwater welding job in San Diego. Amateur pilot, Ron, gets his first taste of canyon flying.

Hoping for a job as a commercial diver, Erik welds a patch on a sunken submarine. Three lessons into his bush pilot training, Ron ends up in a hospital.

Rookie diver Erik struggles underwater while rigging a sunken yacht. Heavy Haul trucker, Fred attempts to transport a 105-ton crane through a hurricane. And tree man, Nate, drops a large dead Eucalyptus tree nicknamed the Widowmaker.

Rookie tree man Tomas freezes in fear halfway up a redwood. Greenhorn diver Erik descends deep into the ocean to collect research samples. And rookie volcanologist Sarah attempts to scale an active volcano in order to land her dream job

Volcanologist Sarah continues her first expedition on an active volcano. Rookie tree men, Nate and Tomas, face off in their most difficult challenge yet. And greenhorn wind tech, Mike, attempts to scale a 120 foot wind turbine.