The Soviets began assisting Asia inside manufacturing of ROMEO submarine in 1959. The Chinese variation is regarded as the sort 033 . The Chinese Type 033 incorporated some improvements regarding initial ROMEO, including sound reduction of anyway 20 dB. A whole of 84 Type 033 submarines had been integrated Asia from 1962 to 1984, plus a couple of exported abroad. Today the majority of the Type 033 submarines happen resigned or preserved, with couple of remaining for training purposes.