Some thoughts of mine, after listening to that captain narrative, who had a good grasp of that boat.
The risk picture seems to be:
HP air storage.
Lots of Diesel.
zero propane.
A little bit of gas for the chase boat.
Genset running all night.
Some compressed Oxygen.
A VHP air compressor.
Possible charging of some high energy Li-Ion scooters.
ER used CO2 for fire suppression.
A bit hard to come up with an explosion scenario. All the components are there for one, but it would take a couple hits to align the swiss cheese. Certainly, leakage of pure O2 in an engine room, along with some gas fumes and an ignition source makes an explosion. Maybe even without the O2 leak. But, O2 will certainly exaggerate it.
Li-ion scooter batteries can be fairly large, and therefore a fire risk that won't want to self-extinguish. Li-ion dive lights have been known to flame up during charge also. Far less regulated industry than laptops and pads, phones, etc.
It has happened that a simple drop of an O2 aluminum cylinder has caused a fiery explosion. Very rare.
Air compressors have been known to explode when unexpected high % of O2 is fed during nitrox blending. But, they would not intentionally run a AC at night due to noise?
