“Surely at least some of these Stone-Age mariners were driven by a spirit of adventure, a quest for glory perhaps”
Then again, perhaps they were the second son of the area ruler, who had already given the woman he desired to his older brother. Part of the success of British colonialism was that only the oldest son could inherit estates. The younger sons had to go find some kind of job. Frequently the military, the priesthood, an overseas job, or an adventure like exploring.