Kristian Stensby, a Norwegian-American with decades in the cruise industry, will tell you everything about his plans for a residential cruiseship, bar one tiny detail: how much it will cost.

Stensby, who founded now-defunct Premier Cruises in 1990, set up Ocean Residences Development several years ago to lay plans for Njord, a vessel with 118 residences that will continually circumnavigate the globe.