Deep beneath the ice-encrusted Arctic seas near the North Pole, atop an inactive deep-sea volcano, a community of sea sponges has survived for centuries by eating the fossils of ancient extinct worms.

With one foot braced on the helicopter's landing skid, a veterinarian lifted his air rifle, took aim and fired a tranquiliser dart at a polar bear.

Were dragons just misunderstood dinosaurs? Could unicorns trace their horns to the Arctic seas? And did a real sea monster ...

Venture into the heart of longline fishing, one of the most powerful and effective deep-sea fishing methods used to catch ...