Condensation chamber

A condensation chamber was a device used in the process of steaming, a form of execution. The victim was placed with the chamber and would then enter the steamer by travelling along some track automatically. There, high pressure steam would fill the chamber, scolding the victim.

Leela was placed in a condensation chamber in preparation for her execution. After K9 stopped the flow of water, the Fourth Doctor was able to enter the steamer and pull Leela from the chamber. (DW: The Sun Makers)