This is the final submarine the Russian shipbuilder i
The first submarine, dubbed HQ-182 Hanoi successfully made its first maiden voyage on January 8, 2014.
The second vessel named HQ-183 Ho Chi Minh City docked at Vietnam’s Cam Ranh Bay on March 19, 2014.
Vietnam received the third named HQ 184-Haiphong in March. The fourth was floated out and the fifth was handed over last summer.
Collectively, the six submarines have been nicknamed "black holes" for their ability to remain undetected underwater.
