At 1240 on February 1, 1972, the tankship V A Fogg departed Freeport Texas
en route to the Gulf of Mexico to clean cargo tanks that carried benzene residue.
The vessel was due to arrive in Galveston Texas at 0200 on Febrary 2.
At approximately 1545, February 1,
the V A Fogg suffered multiple explosions and sank.
All 39 persons aboard died as a result of this casualty.
The National Transportation Safety Board determines
that the probable cause of the initial and subsequent explosion
was the ignition of benzene vapors
which were present both within the open cargo tanks [and] on the main deck
of the tankship.
The investigative record in this case does not contain sufficient information
to determine the ignition source of the initial explosion.