Ragnarok (2013) on Netflix

In Norway, the archaeologist Sigurd Svendsen is obsessed with the mythology of Ragnarok that he had researched with his deceased wife, who died of cancer. Sigurd raises his children Ragnhild and Brage alone and expects to receive a donation for the museum where he works to proceed with his research with runes that had been found in the Oseberg ship but the contributors refuse to donate money for his work. Sigurd meets his colleague Allan, who also researches the myth of Ragnarok, and they decide to go on an expedition with archaeologist Elisabeth and Ragnhild and Brage, who are on vacation. Allan hires the guide Leif and they travel to a no-man's land on the border of Norway and Russia. They cross a lake in a wooden raft and they find some relics in a cave but they are stolen and left behind by Leif. Elizabeth spends the night with the children in a container but Sigurd and Allan continue to explore the cave. Soon they discover that the real meaning of the runes is a warning about the danger in the location where they are.