Groundloop - AIUI, it was an attempt to burn the oil rather than to sink the ship. As far as I recall, napalm and the fuel from drop tanks has never been regarded as being particularly effective as an ASuW tactic... (the S-3 that sank an Iraqi patrol boat thanks to a switch foul up that led to the release of the buddy refuelling store rather than the intended Mk 82s notwithstanding).