The Icy Grave of Plura

Story three: The Icy Grave of Plura. Our next story takes us from the claustrophobic squeeze of dry caves,

to the crushing pressure of underwater cave diving. We're going to Norway, to the Plura Cave

System, one of the longest water-filled caves in Europe. In the frigid winter

of 2014, this beautiful but lethal place would become the site of a disaster,

and then a secret illegal mission driven by an unbreakable friendship. On February 6th,

2014, a team of five highly experienced Finnish divers prepared for a grueling expedition,

a full traverse of the cave system. The dive was expected to take about five hours,

reaching depths of over 130 meters, that's 425 feet, through freezing water and sharp,