Frustrating as hell to listen to. Someone else who just doesn't know the first thing about his engine and has no intention of learning. Has all his maintenance done "professionally" somewhere in the Caribbean. You'll know what this means if you've ever worked in the Caribbean as I have.
I saw a similar video interview to this a few months ago with the same mentality. With this fellow, he had no idea of how the fire started but once again, it was related to the engine. In both cases, the solution was to install large sea water pumps to fight the fire which of course, was always inevitable.
I remember taking a diesel course shortly after getting my boat and within a half hour of the first lecture starting, he instructor launched into the deadly consequences of a runaway engine. Rarely happens, but if it does, the most deadly thing that can happen on an inboard boat if you don't know how to shut the engine down. Something is getting into the crankcase and filling it until the piston(s) are pulling oil into the cylinders.
STOP THE AIR.