Possible Clues:

• Soundly study tools brought over by one making raft
• Book subtitled "Across the Pacific By Raft"
• Heyerdahl book
• Raft of 1947
• 1947 South Seas traveler
• Thor Heyerdahl's boat, named after an Inca god
• Expedition made by Thor Heyerdahl
• Thor Heyderdahl's raft
• Sounds like trick for image of figure from New Zealand in famous raft
• Raft in an Oslo museum