The Ming-class submarines (Type 035) are medium sized diesel-electric submarines. In the 1960s China reverse engineered the Russian Romeo Class into the Chinese Romeo-class Type 033. The Ming-class Type 035 were developed in the 1970s from the Romeo Type 033. China built more than 20 Mings from the 1980s to 2000s in part as a hedge against more risky, higher tech conventional sub projects being delayed particularly the Song-class, Type 039 submarine
Speed: (Surfaced) 15 knots, (Dived) 18 knots, (Snorting) 10 knots
Endurance: 8000 miles at 8 knots snorting, 330 at 4 knots dived.
Crew: 57 (10 officers)
It must be remembered that the Ming is a improvement on basic 1950s Russian submarines. Its (pre-teardrop) design and electronics may make the current Ming equivalent to a British Oberon Class submarine of the early 1970s. That said the Ming is inexpensive so Bangladesh can probably afford two.
Bangladesh's two Mings, when handed over by 2019 are probably strongest in brown and green water defensive warfare in the northern Bay of Bengal around Chittagong.