Lake Laogai

History
Hidden beneath the waters of Lake Laogai is an underground facility operated by the Dai Li agents and run by the cultural minister Long Feng. It consists of many chambers and tunnels which hold prison cells and Dai Li and Joo Dee training facilities. These cells also hold equipment used to brainwash people consipiring to destroy the cultural heritage of Ba Sing Se. As it is absolutely forbidden to mention the war against the Fire Nation within the walls, those that do are usually arrested and re-educated using the brainwashing technique used on Jet. It was presumed to be destroyed in "The Earth King".

Trivia

 * The term Laogai is an abbreviation for Laodong Gaizao, 勞動改造, which means "reform through labor," and refers to the use of prison labor in the People's Republic of China. [6]