The Second Artillery Corps (SAC) () is the strategic missile forces of the People's Republic of China. The SAC is the component of the People's Liberation Army that controls China's nuclear ballistic and conventional missiles. China's total nuclear arsenal size is estimated to range between 240 nuclear weapons to as many as 3,000 warheads hidden within an extensive tunnel system referred to as an "underground great wall", while retired Russian General Viktor Yesin estimates that China has 1,800 warheads, with 900 of them being deployed and the rest in reserve. However, Yesin's claims appear to be dubious, due to a lack of available resources for a missile force of such size. As of 2013, United States Intelligence estimates the Chinese ICBM arsenal to range between 50 and 75 land and sea ba