At the time the traffic separation scheme in the area of the Alphard Banks introduced a very fine 'dog's leg' into the track of ships using the TSS.
This put them into a 'crossing fine' conflict with ships that were not using the scheme - many at the time were not - and were going 'straight through'.

In August 1972 she was in collision near Stilbaai, South Africa with the empty tanker TEXANITA (100,613 dwt), which exploded, split in two and sank in minutes with the loss of 33 of its crew. One crew member of OSWEGO GUARDIAN was also killed.The accident acted as a spur for change to marine traffic separation procedures and to the mandatory inerting of tankers.

With 275 metres longer than a current Suezmax tanker but only 39 metres wide and the depth (18.90) of an MR2 product tanker, she carried the the DWT of an Aframax. The SBT/Double Hull design revolution has altered dimension parameters for crude oil tankers considerably.
Nice shot Bob.