While on a ballast voyage from Yokohama to the Persian Gulf,
the 72,658 dwt Japanese motor tanker Tosa Maru
was in collision with the fully loaded 149,634 Liberian
motor tanker off Singapore, one mile south of the St Johns Islands,
at 11 pm April 17, 1975.
The impact resulted in immediate explosions,
with both vessels being set on fire,
and a large quantity of blazing oil
spreading across the surface of the sea.
The 31 crew members of the Japanese tanker were quickly rescued
by a supply vessel.
Following further explosions, the Tosa Maru, still on fire,
sank by the stern in lat 01.11.18N, long 103.50E at 1 pm on April 18,
her bow remaining above water at the angle of 45 degrees.
The Cactus Queen which had been proceeding from Mena al Ahmadi, Kuwait
to Henza Island Japan with 121,000 tonnes of crude oil,
managed to resume her voyage after he fire had been extinguished,
to discharge her enormous cargo safely.