Was an American registered tanker as I recall, wasn't exactly sunk in the traditional sense but after making port was considered beyond repair and later scrapped.
Edit,
Checked facts and I was close but this seems the official line.
http://www.naval-history.net/F52week11TF.htm
Quote:
South Atlantic - Tuesday 8th sees the only non-belligerent casualty when two Grupo 2 Canberras mistakenly bomb the American-registered tanker "Hercules" then on passage to the north east of the TEZ. On putting into Rio de Janeiro, a UXB is found that is too dangerous to disarm, and the ship has to be scuttled off Brazil in late July.
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