The Akula I-class displaces 13,000 tons when fully submerged. It has a steel double-hull design. The submarine’s engines are “rafted” to reduce sound that could be picked up by enemy sonar.

TASS/. The Project 971 ‘Shchuka-B’ [NATO reporting name: Akula] nuclear-powered underwater cruiser Gepard successfully struck a notional enemy’s submarine with an anti-submarine missile ...

MOSCOW, December 28. /TASS/. Mikhail Budnichenko, director general at the Sevmash naval shipyard has said no other Navies in the world have a submarine like the Akula-class Dmitry Donskoy.

The US Navy has 3D printed a prototype submersible hull at the Oak Ridge National Lab in Tennessee. It could be in service by 2019. The departments of Defense and Energy collaborated on the project.