Much respect to this man as a fundraiser. He convinced people to pay him to play Viking and go sailing as his job. Could be grants or private fundraising or both.
It illustrates how one monetizes a PhD in a subject overtly noncommercial like archaeology. Plenty of people have sailed in these waters, maybe even played at being Vikings. But with a doctorate in the field, one is able to make the case that doing so will be Real Science because you have developed expertise in that knowledge domain, and research skills to fit whatever you find into the broader scientific context.
I’m not being dismissive, by the way, it’s a fantastic idea to explore for new archaeological finds. And it is absolutely true that academics need to have as much hustle as entrepreneurs to find funding.