In 1912, the vast number of imitators prompted Houdini to replace his Milk Can act with the Chinese Water Torture Cell. In this escape, Houdini's feet would be locked in stocks, and he would be lowered upside down into a tank filled with water. The mahogany and metal cell featured a glass front, through which audiences could clearly see Houdini. The stocks would be locked to the top of the cell, and a curtain would conceal his escape. In the earliest version of the Torture Cell, a metal cage was lowered into the cell, and Houdini was enclosed inside that. While making the escape more difficult (the cage prevented Houdini from turning), the cage bars also offered protection should the front glass break.
The original cell was built in England, where Houdini first performed the escape for an audience of one person as part of a one-act play he called "Houdini Upside Down". This was so he could copyright the effect and have grounds to sue imitators (which he did). While the escape was advertised as "The Chinese Water Torture Cell" or "The Water Torture Cell", Houdini always referred to it as "the Upside Down" or "USD". The first public performance of the USD was at the Circus Busch in Berlin, on September 21, 1912. Houdini continued to perform the escape until his death in 1926. Despite two Hollywood movies depicting Houdini dying in the Torture Cell, the escape had nothing to do with his demise.