MOSCOW, January 23. /TASS/. The fourth Project Yasen-M multipurpose nuclear submarine Krasnoyarsk has completed hydraulic tests of the pressure hull and its structures, the Sevmash Shipyard, the submarine’s manufacturer, told journalists.

"A major construction stage - the hydraulic tests of the strong hull and its elements - has been completed on the nuclear submarine Krasnoyarsk. The submarine has successfully passed the tightness test and its hull has withstood the characteristics laid out by the designer. Further planned work is ongoing to prepare the hull for insulation and assembly works," the Sevmash Shipyard press office said.

The Krasnoyarsk is the fourth multipurpose nuclear-powered submarine in the Yasen-class series (Project 885) designed by the St. Petersburg-based Marine Engineering Design Bureau Malakhit. The submarine was laid out in 2014. Overall, five submarines of this project are under construction at the Sevmash Shipyard in Severodvinsk in north Russia.

The first Project 885 nuclear submarine Severodvinsk was delivered to the Russian Navy on June 17, 2014 and underwent operational evaluation until the spring of 2016. The other submarines are being built under the improved Yasen-M project.