A sauna was a room or structure, which was heated to a very high temperature, so its occupants could sweat and relax. The Cardassian sauna was a variety of this.

When confined to the catwalk of Enterprise in 2152, Malcolm Reed asked Chief Engineer Tucker whether he could build a shower, to which Tucker sarcastically replied if he'd like a sauna as well. (ENT: "The Catwalk")

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