Exhibit A: the Kuznetsov. Yes, it genuinely is supposed to look like that - it was designed to burn the absolute cheapest bunker oil, the utter dregs of what's left over when oil gets refined. Here's a view of the Kuznetsov from orbit.
I don't seriously think these tankers aren't burning, of course, I just take every opportunity I can to rag on the Kuznetsov. Won't get too many more of those in the future.
Aww. Reality once again spoils fun.