CAHILL_C has a complete description, page 6,
which makes fascinating reading.
This was a classic dance of death.
Fabiola expected stbd to stbd,
Bonifaz expected port to port.
At last minute Fabiola first went hard port
then when he realized this was not going to work,
went hard starboard.
Near 90 degree angle of impact.
Bonifaz, altered 10 degrees to port
about 8 minutes before impact,
and then did not do much at all.
All the deaths were on the Bonifaz.
Fabiola (IMO 5111517, FR) was twin screw,
but, since she was at 15 knots,
would not have made much difference.
nor attempt at communication.
We have no penetration data.
Cahill indicates that the spill from the Fabiola
ignited, and then the gas in the Bonifaz's tanks exploded.
This implies that at least the forward cargo tank(s)
of the Fabiola were breached,
which combined with a near-90 degree angle of impact
implies a depth of impact of at least
the length of the Fabiola's FP tank.
Anyway with a 20,000 dwt tanker being T-boned
by a loaded 56,000 dwt at 15 knots,
we can be confident double sides
would have made little differences.
But inerting might have made a big difference
in the death toll.