So a handful of descendants of the Vikings build a balsa raft in 1950 Peru and sail it to Tahiti to prove that Polynesia was settled not from the West, by Asians (paddling against the current), but from the East, by Peruvians, or someone along the line of the Inca's. Having just survived the first class disaster and life altering epic that was WW2 they have rather improved priorities over the average person in the audience today and they all work together so not a lot happens.
In short, what a boring picture from the standpoint of the writer and director. Not even a single near-naked woman to parade about, just lots of white guys with no body hair who still manage full heads of blonde hair and beards to die for. So, they swap out the athletic "Black Norwegian" who didn't have blonde hair and made him a panic stricken tubby---the only guy on the boat who isn't tall and thin and gorgeous, but of course! If Nazis had come out of the sharks belly you could bet they would all be bald. Such is Hollywood, even when it's a Norwegian film.
Ah well. It's a fairly fast paced film, there are sharks and amazing glowing creatures at night, and eventually they end up in Thailand, well beyond Polynesia, but, well, you know, Hollywood and all that. And lots of near naked descendants of Vikings to look at.
Hey, after all these years, decades, it made me want to read the Heyerdahl book on which it's based. And Amazon is streaming the original documentary on which this is based, too!