A first look at Badedampfer, where a floating sauna and six self-drive hot tub boats share a mooring on the Spree at Treptower Park. Between rounds of heat, guests jump straight into the river with the TV Tower in view. The full film, premiering on Sauna Channel in fall 2026, follows the company from a sketch drawn by its 24-year-old founder to its plans for new stations beyond Berlin.