Doesn't sound like the firefighters had air packs or other hazmat gear. It's interesting that the particular photo on the russian website is actually a US DOD photo - here is the caption on the US government website for that pic:
ID: DNSC9600521 Service Depicted: Other Service
An aerial stern-on view of the Russian Northern Fleet AKULA class nuclear-powered attack submarine underway on the surface.
I guess we have better photos of their subs than they do