What would you do if stranded in one of the harshest places on Earth for 18 months?

In 1864, five men were shipwrecked on the uninhabited Auckland Islands – isolated in the freezing subantarctic.

With no hope of rescue, they faced starvation, frostbite and madness.

Their only chance? Build a boat from wreckage and attempt an impossible escape across 450km of treacherous sea.

This is the true survival story of the Grafton castaways – engineers, sailors and survivors – who defied all odds in one of the most extraordinary rescues in maritime history.