The former anti-aircraft shelter, today is a striking reign of thermal wellness. Porretta Terme was one of the places where The Second World War broke out, as it was located right on the Gothic Line, where the retreating Germans were deployed between 1944 and 1945.
The presence of two important lines of communication, the road and the railway, made this territory a continuous object of the Allied bombing. Therefore, the construction of anti-aircraft shelters was necessary. One of these underground shelters has radically changed its destination, from the place of salvation from war to place of well-being because in it, within the Hotel Helvetia, a striking Biosauna has been created (along the exit stone staircase of the shelter ), a Finnish sauna, a large flavored Hammam, two emotional showers and a relaxation area. In this area, which can be reached through a corridor dug deep in the mountain and hinted by cuts in the rock that look obliquely at the pool, the twilight reigns which is warmed by delicate lights.
The bio-sauna, where the temperature does not exceed 40 ° C and humidity varies from 45 to 55%, allows the body to acclimatise and better withstand the more intense temperatures of the Finnish sauna and the Turkish bath. The classic Finnish sauna, all covered in wood, is located on the side and has a temperature around 80 ° C and a humidity level of 15%.
At the end of the cave there is the large aromatized hammam (45 ° C, 95% humidity), with mosaiccovered seats and a ceiling of lights, made of hanging optic fibers, to give the idea of a sky starry.