The walls of the hot cell are made of thick radiation proof material. The windows are made of two 3" thick plates of lead glass with 3 feet of optical oil between. The lead in the glass gives it the characteristic yellow colour. The hot cell is equipped with two waldoes, or teleoperator arms. These are used to perform all operations in the hot cell, such as disassembly of targets or repair of equipment. An experienced operator can use wrenches, compressed air tools such as a drill, etc. to perform complex machining tasks.