SWANSEA, Wales: Four centuries and one year after the Mayflower departed from Plymouth, England, on a historic sea journey to America, another trailblazing vessel with the same name has set off to retrace the voyage.

This Mayflower, though, is a sleek, modern robotic ship that is carrying no human crew or passengers. It’s being piloted by sophisticated artificial intelligence technology for a trans-Atlantic crossing that could take up to three weeks, in a project aimed at revolutionising marine research.