There are rumours that this ship was involved in smuggling oil to South Africa.
One popular press source says
"blew up alledgedly as a result of incompentent tank cleaning".
This is plausible, and consistent with the Hooke account.
The ships in this trade tended not to have the best owners.
The ship was tank cleaning and the first explosion occured before dawn,
so it is extremely unlikely that anyone would be in the tanks.
If the tanks they were machine washing had been properly inerted,
there is nil chance they would have ignited.
It is possible this 1971 built VLCC was not fitted with Inert Gas.
IMO did not make this a requirement until 1984.
More likely, they just screwed it up.
But we just dont know.
The spill volume is probably unfounded.
Using ETC's incorrect conversion factor for bunker fuel, 29320B is 4000T,
which probably is their "standard" figure
for unknown amount of bunkers on board a VLCC.