Delta IV Shipyard Fire

Reading between the lines of this story about a fire aboard RFS Ekaterinberg (K 84), I'm guessing the shipyard used turpentine-impregnated wood in building the scaffolding. Excerpts:
Television pictures showed a giant plume of smoke above the yard in the Murmansk region of northern Russia as over 100 firemen struggled to douse flames which witnesses said rose 30 feet above the stricken vessel. Emergency workers said efforts to partially sink the submarine at the dock had failed to fully extinguish the fire. A defense ministry spokesman quoted by state news agency RIA said the blaze, which began at 1220 GMT (7:20 a.m. ET), was under control more than eight hours later...
...After hours of trying to put out the flames, officials decided to partially submerge the hull of the 18,200-tonne submarine at the Roslyakovo dock, one of the main dockyards of Russia's northern fleet 900 miles north of Moscow.
Local media reports were vague, but the blaze was believed to have started when wooden scaffolding caught fire during welding repairs to the submarine, which had been hoisted into a dry dock.
Earlier reports said the reactor was shut down after the fire started, but I'm guessing that was just media reporters who don't understand the military coming up with that one there own. Any fire that's bad enough for them to decide to try to submerge a boat undergoing refit must be pretty bad, though. I'm wondering if the Delta IVs have some sort of hull coating, and if maybe it got hot enough for that to catch fire?

What's the dumbest thing you've ever seen shipyard workers do to endanger Sailors?