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Their hands were strapped to ropes attached to a pulley system. The pulleys were attached to large barrels of sulfuric acid propped up above their heads.
— Tapp describes the trap[src]

The Acid Barrel Trap is a trap from the Saw franchise. It is an unseen trap in the series.

Design and Function

The Acid Barrel Trap consisted of a pulley system and a number of large barrels filled with sulfuric acid. Those were propped up above the heads of two victims, whose hands were strapped to ropes, which were attached to the pulley system. If both of the victims pulled at the same time, the pulley would give them enough slack to reach the exit door leading out of the room. However, it can be assumed that something prevented them from working together. (Saw II: Flesh & Blood)


Mitsuka Ito and Ronnie Navarro's Test

Shortly after the beginning of his series of murders, John Kramer, better known as the Jigsaw Killer, targeted Mitsuka Ito, a member of the local Yakuza, and Ronnie Navarro, a drug dealer and member of the Blood Eye Gang. After he abducted them, he took both of them to a room and strapped them to the trap. It is unknown what exactly they had to do in order to survive. Eventually, both of them died when their bodies were spilled with the sulfuric acid. (Saw II: Flesh & Blood)

Jigsaw Investigation

After their death, Jigsaw cut two jigsaw pieces from their skins. The bodies were later found by the Metropolitan Police Department. When Detective David Tapp arrived at the crime scene, the acid hadn't left much of Ito and Navarro's corpses. They were sent to the morgue by Jennings Foster. Back at the police station, Tapp wrote a report about the incident. He speculated that something likely prevented Ito and Navarro from working together. (Saw II: Flesh & Blood)