Dwane's friend and fellow diver, Tim, joins the team as they collect a slimy alternative to urchin. Along for the ride is 16-year-old Storm, who is determined to make his mark as a valued member of the crew.

The crew heads to the southernmost part of Stewart Island, the last stop before Antarctica. Despite the icy waters and cold conditions, the competition between the divers is fierce - although for one member of the team it will be their last trip.

Skipper Dwayne and the crew head to a consistent urchin dive spot. A keen young dingy boy, George, endures a baptism of fire as the team tries to fill a backlog of orders.

A desperate fast turnaround order forces a full crew aboard the Southern Leader as Dwayne and his team try to deliver in half the time than usual. Despite their relentless work ethic of the divers they are met with a huge surprise back at port.

Dwayne is out to fill a massive order of urchins, and a bigger boat and a larger crew called in for the task at hand. However technical problems, freezing temperatures and the power of the southern ocean puts the whole operation in jeopardy.