Expeditions to the Edge

Rescuers try to save a trapped cave diver who ran into trouble after plunging 250 feet below ground in New Zealand.

Four men on an experimental minisub get tangled in the wreck of a sunken warship and must wait for the Navy to rescue them.

A family fights to survive when killer whales attack its schooner.

The Galeras Volcano erupts while scientists, tourists and reporters explore the volcano, killing nine people.

Men and women competing in the Iditarod find themselves fighting to survive when a blizzard with sub-freezing temperatures and heavy winds hits the coast of Alaska.

As Neil Armstrong and David Scott try to complete the world's first orbital docking mission, the Agena space module begins a violent tumble causing the astronauts to make an emergency landing from space.