The third Diesel-electric submarines 636 Project will be transferred to Vietnam Naval Forces before the end of this year.
A senior source in the Russian shipbuilding industry said the fourth submarine will be delivered to customers in 2015. The fourth Kilo submarine will conduct tests in this year.
The multipurpose diesel-electric submarines of Project 636 belong to the third generation. They are considered one of the quietest in the world, and the submarines can cruise underwater at a speed of 20 knots and has a cruising range of 400 miles.