Very shortly after , the Blythe Star 's bow lifted high .
Bow sank stern - first into the Southern Ocean , approximately five miles west of South West Cape in 80 fathoms ( 480 feet ; 150 metres ) of water .
Very shortly after , the Blythe Star 's bow lifted high and it sank stern - first into the Southern Ocean , approximately five miles west of South West Cape in 80 fathoms ( 480 feet ; 150 metres ) of water .