The Brtish flag motor ore carrier Tritonica,
registered at Hamilton, Bermuda,
was on a voyage from have St Pierre, Quebec
to Sorel near Montreal,
with approximately 18,300 tons of ilmenite,
when she was involved in a collision in dense fog
with the British steamship Roonagh Head
shortly before 3 am on July 20, 1963
off La Petite Rivere St Francois
about 40 miles east of Quebec City.
According to the master, Captain J G Swanson,
his vessel sank within 8 minutes of the collision.
18 of his crew were reported to have died
while a further 15 remained missing, presumed drowned.
The Canadian river pilot on the Tritonica
was also listed as being among those missing.