Long Lost Arctic Army Base (S03E09)

A hidden military installation emerges just a few hundred miles from the North Pole. Beneath Lake Huron, researchers uncover an ancient stone structure that lies 120 feet deep. Along the Baltic Sea, a burial site dating back 1500 years is unearthed. Meanwhile, in Russia's remote eastern regions, scientists stumble upon a life-form encased in permafrost, believed to have the ability to survive for millennia.