Off the southern coast of Africa lies an underwater metropolis like none other on the planet: Aliwal Shoal. A fossilised dune of towering pinnacles and deep caves hidden five kilometres out to sea, Aliwal Shoal is a place where sharks flock and fish walk on the bottom of the ocean.

During the Arctic spring and summer, one of Earth s most dazzling displays of rejuvenation takes place in Canada s far north. A brief season of light and plenty brings great migrations of bowhead and beluga whales, harp seals, caribou, and polar bears. It also brings an Inuit hunter whose aim is to teach his 12-year-old son the traditional survival skills of his ancient people.