We hatched a plan to create a small camp near the den to monitor activity until the rest of the crew flew in by helicopter in six days' time.

Iceland is an island of extremes, where some of Europe's biggest glaciers cozy up to some of the continent's hottest volcanic springs.

TOOTHWALKERS presents extremely rare under-the-ice footage that reveals a complex and potentially dangerous side to this huge and often mysterious mammal.

TOOTHWALKERS presents extremely rare under-the-ice footage that reveals a complex and potentially dangerous side to this huge and often mysterious mammal.

TOOTHWALKERS presents extremely rare under-the-ice footage that reveals a complex and potentially dangerous side to this huge and often mysterious mammal.

TOOTHWALKERS presents extremely rare under-the-ice footage that reveals a complex and potentially dangerous side to this huge and often mysterious mammal.

TOOTHWALKERS presents extremely rare under-the-ice footage that reveals a complex and potentially dangerous side to this huge and often mysterious mammal.

TOOTHWALKERS presents extremely rare under-the-ice footage that reveals a complex and potentially dangerous side to this huge and often mysterious mammal.