Turns out this was no average submarine:
14 Sailors Die on Secretive Russian Nuclear Submarine
(excerpt)
The boat was identified by Russian-language news service RBC as Losharik (AS-12), a nuclear-powered submarine that is widely believed to be a key asset for the Russian Main Directorate of Deep-Sea Research, also known as GUGI. GUGI develops and operates a fleet of specialized submarines that Russia uses for deep sea and Moscows most covert operations.
Losharik is among the most mysterious of the closely guarded fleet. The about 2000-ton boat can travel slung under the belly of a specially modified Delta III nuclear ballistic missile submarine, according to open source intelligence analyst).

Only 14 on board? or 14 died or 14 died so far???? Can’t get to any of the links. Timing out!
Losharik fire in Arctic waters.
Those crazy Canucks. What won’t they do to get attention.
#movingeyebrowswerentenuf
Maybe that’s the rogue sub that fired the missile near Whidbey Island.
Just WILD speculation here. I don’t have any inside knowledge.
Russia to speak with China re: Losharik.
I think THIS is why POTUS & VPOTUS are hunkering and bunkering.