My first ever car, an Austin, had a problem like that. I was driving in the rain and felt a splash of water on my mush. Discovered that there was a large fibre glass patch which had de-bonded in the passenger floor, which opened like a flap valve...
If it fails, I think you are permitted to drive to a place of repair - eg your independent where you are taking it for them to look at the cog box. So long as it's not a dangerous fail item. (check the rools though)
So what do we fink happened. Excess revs blow'd one of the air pipes oft and the hot gas set it on fire? Turbo pipe split? Result fuel lines caught fire.
Tankers can be very tough ships. During the days of convoys many stayed afloat despite torpedo hits. I suppose because they are divided into tanks or sections or summat that meant damage could be localised. . Or were, back in the day. So I think...