Describe the performance of Kon-Tiki's central character as wooden and you've hit the nail on the head. Kon-Tiki was a balsa-wood raft Norwegian ethnographer and adventurer Thor Heyerdahl built in 1947 to prove ancient South Americans could have floated to Polynesia, thus challenging accepted theory that continental drift was west
Kon-Tiki: Historic exploit relived
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Still from the film 'Kon-Tiki'. Photo / Supplied
Roenning and Sandberg even held auditions for the film at the Kon-Tiki Museum in Oslo, where Heyerdahl's raft is housed.
"We got Thor's son, Thor jnr, to tell us about his father. And Thor's grandson, Olav, also came and talked about his expedition because he actually sailed the same route in 2006. And that's the raft we used in the movie.
"So the movie raft has actually made the voyage."
Shot in six locations, Kon-Tiki is beautiful to behold, even if the crew's conditions were cramped and claustrophobic.
"We were over a month on the ocean and that was just magical," recalls Sandberg. "It was, of course, very tricky because you can't really steer that thing.
The actors actually had to learn how to sail it and make everything work.
"Now I've forgotten about the hardships," he concludes. "I mostly remember the wonderful sunrises and sunsets we got to see out there. It was an inspirational experience."
• Kon-Tiki opens in cinemas on May 16.