You’re confusing two different incidents. The missiles was stanislav petrov, who made the decision to not retaliate alone, as a lieutenant in a nuclear missile battery on land. The three man panel was a diesel electric sub that was trapped by NATO forces, and without contact with the kremlin for several days had to choose between surfacing and firing their nuclear torpedo. The captain and political officer voted to fire, but the third guy, who was some sort of admiral, refused to agree. So the sub surfaced, confirmed there was no war, and went back home.