It was indeed an alkaline hydrolysis machine.
Per Wikipedia:
"The process is based on alkaline hydrolysis: the body is placed in a pressure vessel that is then filled with a mixture of water and potassium hydroxide, and heated to a temperature around 160 °C (320 °F), but at an elevated pressure, which prevents boiling. Instead, the body is effectively broken down into its chemical components, which takes approximately four to six hours. A lower temperature and pressure may be used, but at a longer duration (98 °C (208 °F), 14 to 16 hours). At the beginning of the process, the mixture is strongly basic, with a pH level of approximately 14; pH drops to 11 by the end, but the final pH level depends on the total operation time and the amount of fat in the body."
