M/S Laine is Lake Näsijärvi's largest sauna boat. From October to April it stays moored at Santalahti harbour as an ice-swimming sauna, a five-minute trip from central Tampere. Public sessions run Thursdays and Sundays 3 to 9 PM until the end of April 2027, at EUR 10, booked online or on arrival. The wood-fired sauna takes up to 10 people, there is a lake dip, a rooftop hot tub that is sometimes heated, and a fireplace lounge. The boat is also hired out to private groups.