At 0255 on March 18, 1973, the Zoe Colocotronis en route to Guayanilla, Puerto Rico
ran aground on a reef 3.5 miles off the La Parguera tourist area on the SW coast of Puerto Rico.
The master ordered water and cargo from the forward tank jettisoned to help get the vessel off the reef,
so 37,579 barrels of crude oil were intentionally released.
The master later stated that the gyro compass, radar and depth sounder were not working properly.
No distress or notification calls were made,
and the master initially insisted that no oil had been released.
Winds were 18-19 knots, and seas were 1-1.5 feet.