as Knyaz Vladimir, and two Delta IV-class ballistic missile submarines (SSBN) together armed with 48 SLBMs surfaced simultaneously from under the ice with precision in a limited space with a radius of 300 meters for the first time in the history of the Russian Navy and former Soviet navy and in the world. The operation was part of the Umka-2021 exercise. The ice of 1.5 meters thickness was broken firing a torpedo. Russian Northern Fleet subs train all the time under ice conditions including cruising under Arctic and as a part of training they learn how to find or make holes with a torpedo in ice in order to surface and dive. Russian navy submarines break ice on regular basis and have developed special weapons to break ice in order to fire SLBMs, first time tested in 2014. References Borei-class submarines Ships built by Sevmash