Source: RTD.RT
The Yasen-M is an entirely new class of submarine designed from the keel up. Despite being the size of a 9-storey building, this multifunctional, rapid, almost silent vessel is being compared to an underwater jet fighter because it can both act independently or defend a strategic missile carrying sub.
One of the most distinctive features of Yasen-M-class submarines is their hull. Usually, subs have a double hull – a light outer casing and a stronger inner shell. However, the Yasen-M is mainly has a single hull made from materials specially developed for maximum strength and malleability, welded together using special techniques.
Another feature is the unconventional placement of the missile launchers and torpedo tubes on the side of the boat rather than the bow. The Yasen-M submarines are entirely covered by a thick rubber-based coating to reduce noise in the water. The subs can remain self-sufficient on patrol for several months.
Read more at: https://rtd.rt.com/serial-episode/yasen-m-destroyer-of-the-depths/