The SS Silla is officially the world’s fastest floating sauna, setting the world record last Saturday, July 4th in Marstrand, West Sweden, during Match Cup Sweden. The sauna reached 15.5 knots (nautical miles per hour), the equivalent of 28.71 kph/17.84 mph. To give you an idea of of how fast that is, the fastest speed acheived by a boat was 275.9 knots, the fastest human swam 4.6 knots, and the fastest aquatic animal, the sailfish, can reach 59.1 knots. The SS Silla’s 15.5 knots will most certainly allow for relaxing in a jacuzzi in style.