Secrets in the Ice

A grim discovery in a Swedish lake reveals shocking ancient practices. Meanwhile, in the Canadian Arctic, the fossil of a previously unknown mammal is found.

In a Danish bog, hundreds of mutilated ancient bones are found, while a mysterious deserted island belonging to Russia is explored.

Archaeologists in Russia find several mass graves, a plane from the Second World War sits on a Canadian mountain, and cosmic rays in Antarctica stump experts.

Human remains are discovered high in the Ecuadorian Andes, while a strange earthquake-like event is investigated in Canada.

Graves dating back some 34,000 years are discovered in Russia, and a team attempts to locate a British aeroplane that went missing in Iceland during the Second World War.

Off the coast of Antarctica, a volcanic island with a mysterious past is explored. The mummified corpse of a teenage girl is found in the Peruvian Andes. And a shipwreck is found near the Franz Josef archipelago in Russia.

Mysterious industrial waste is discovered in an uninhabited part of Greenland, and strange mounds are found deep within the Arctic Circle.

A group of hikers trekking across the Italian Alps stumble upon abandoned military infrastructure, and questions remain about the purpose of these camouflaged buildings.

A secret military base is discovered a few hundred miles from the North Pole, while a man-made stone formation is found 120-feet below Lake Huron.

A giant naval vessel is located on the bottom of the Norwegian Sea, while an ancient reptile-like creature is found in Canada.