There is a lot of confusion about this casualty.
Itopf says 60,000 tons and most sources have a similiar numbers.
But this seems unlikely.
Hooke makes it clear part of the cargo was lightered.
Going with ETC number.
Some sources say 10 miles NW San Juan.
Colcotronis ships have a very bad record.
Cause is quite uncertain.
Engine room fire or cracks in hull as primary cause?
Photo taken from air after the fire was out,
shows house blackened, but stack is not.
The ship is very deep in the water,
decks nearly awash but on even keel.
Clearly all or almost all of the cargo is still on-board.
Little or no cargo was spilled in the fire,
If an ER fire caused the cracks,
then she should be down by the stern.
And the photo indicates it was not an ER fire,
but much more likely a PR or Accom fire.
Based on this photo, CTX is guessing
the cracks came first, flooded the ballast tanks
more or less evenly, and somehow started a PR fire.
One way this could happen is for the duct keel to be involved.
But until we get more info, this is speculation.
For now calling the primary cause, probable hull failure.