re: Russian sailors who died fighting fire on nuclear submarine averted planetary catastrophe

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US does the same thing I’d imagine.

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Define "Much". 10%?
Captain, Executive Officer, Weapons Officer, Ast. Weapons Officer, Communications Officer, Navigation Officer, Engineering Officer, and a couple more in the Engineering Dept. (Reactor Engine Room)
Crew was about 115 men
That was on an FBM Sub back during the cold war.

Accidents will happen.

We were in Dry Dock changing out a Reactor core after several years/patrols.
There power power cords, airlines, oxygen lines and acetylene lines running all over the ship. There were craftsmen grinding and others welding at several stations. One evening, at changing of the watch, a sailor walked aboard, smoking his cigarette, ready to assume his watch duties. As he walked aboard his newly lit cigarette burned down to the filter. He was properly trained, so immediately he recognized there was an extremely high oxygen content in the atmosphere in that area. He immediately sounded the alarm and over the MC system he ordered all grinding and burning to cease, and all Shipyard personnel to vacate the ship.
After an investigation it was discovered that one of the craftsmen had connected his pneumatic grinder to an Oxygen manifold.
The spent oxygen was collecting in the compartment.