Business Insider:

This couple from Bavaria built the world’s first zero emission and autonomous boat — that’s what it looks like

Business Insider reports:

 "On Saturday, the world's first zero emission and autonomous boat was christened on the Schlei in Schleswig-Holstein. The 3.20 meter long boat "ZeroOne" marks a turning point in shipping, which is currently responsible for almost three percent of all greenhouse gases."

https://www.businessinsider.de/wirtschaft/mobility/ehepaar-aus-bayern-baut-erstes-autonomes-emissionsfreies-boot-2021-8-a/