They combined two innovations: nuclear power and a teardrop hull design ... rather than an intact submarine passing through collapse depth." Thus the tragedy was caused not by a torpedo or ...

Catastrophic failures could also occur without a sub hitting its collapse depth. Any damage or flaws in the sub's construction may create a weak point and cause the hull's failure. At extreme ...

The Irkutsk, following the K-239 Belgorod submarine of Project 949A, has returned to service after a prolonged stay in the shipyard. The Belgorod, having its hull ... the collapse of the USSR ...