Balsa wood raft used by Thor Heyerdahl to sail from Peru to the Tuamotus in 1947 (3-4)
I believe the answer is:
kon-tiki
(Other definitions for kon-tiki that I've seen before include "Thor Heyerdahl's raft" , "Thor Heyderdahl's raft" .)
I've seen this clue in The Mirror.
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