No fabled creature of the Pleistocene Era has a more powerful hold on the imagination than the woolly mammoth. Cave paintings of the giant beasts hint at the profound role they built igloo-shaped huts out of mammoth bones, sewed their clothing with mammoth hair, even feasted on mammoth tongues. Eager to uncover more clues to this vanished prehistoric age, explorers since the time of Peter the Great have scoured Siberia for mammoth remains. Now a new generation of explorers has taken to the tundra. Armed with GPS ground-penetrating radar, and Soviet-era military helicopters, they seek an elusive prize: a mammoth carcass that will help determine how the creature lived, how it died- and how it might be brought back.