Conversation so far:
What was he doing?
In 1955-1956, Heyerdahl organized the Norwegian Archaeological Expedition to Rapa Nui (Easter Island.
Who was apart of this team?
The expedition's scientific staff included Arne Skjolsvold, Carlyle Smith, Edwin Ferdon, Gonzalo Figueroa and William Mulloy.
Heyerdahl and the professional archaeologists.
What did they do while there?
archaeologists who travelled with him spent several months on Rapa Nui investigating several important archaeological sites.

Question: What where highlights of the dig?
Self-contained rewrite: What where highlights of the Rapa Nui archaeological dig?