Human beings have been able to survive in practically every environment on Earth---from deserts to the frozen reaches of the Arctic. But what about living under the sea? Host Chuck Pell tries out a underwater ‘tent’ that allows explorers to spend hours, and even days, beneath the ocean’s surface. Future explorers use the Utah desert to simulate what it will be like to live on Mars. And a California architect combines cardboard with the ancient Japanese art of Origami to provide quick homes that work in almost any environment.