Several sturdy animal cages were installed on Hydra Island. After his capture by the Others, Sawyer was held in one cage at the Hydra facility, and Karl was held in a cage opposite Sawyer's. After Karl's escape, Kate replaced Karl in the cage. ("A Tale of Two Cities") After Sawyer and Kate's escape from Hydra Island, Jack was held in Sawyer's cage. ("Stranger in a Strange Land") Sawyer later attempted to use the "punishment" function of the system to electrocute Ben Linus, but when Sawyer put his plan into action, he found, to his frustration, that the Others had disabled the system.