The submarine codenamed HQ-186 Khanh Hoa is the fifth of the six Project 636.1 diesel-electric submarines ordered by Vietnam.

The first two subs, HQ-182 Hanoi and HQ-183 Ho Chi Minh City, arrived in Vietnam in early January and mid-March.

The third one, HQ-184 Hai Phong, was loaded into the Dutch-registered cargo ship Rolldock Star on December 16 and is scheduled to be delivered to Cam Ranh Port in late next month.

The fourth one, HQ-185 Da Nang, was launched on March 28 and is undergoing testing.

The sixth and last one, HQ-187 Ba Ria-Vung Tau, was built from May 28 and is scheduled to be delivered to Vietnam in 2016.

The six submarines, which are considered improvements over the older Kilo-class, feature six 533 mm tubes that can launch TEST-71 series anti-surface and anti-submarine heavyweight torpedoes.

They were built under a US$2-billion deal signed during a visit by Prime Minister Nguyen Tan Dung to Russia in 2009.

Under the contract, Russia will deliver all by 2016, train Vietnamese crews, and supply necessary spare parts.

By Anh Son - Thanh Nien News - December 30, 2014