Wildlife: Resurrection Island

National Geographic wildlife filmmaker Bertie Gregory takes audiences on an adventure to iconic South Georgia Island. Sailing through the roughest ocean on the planet in a 50-foot boat, his team's target is the sub-Antarctic island, known for its breathtaking scenery and high concentration of wildlife. It's a life of extremes for Antarctic fur seals. Bulls fight to the death for breeding rights, while seal moms work to raise their adorable pups.

• Bertie GregorySelf