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The sunken vessel was found intact, still attached by a steel cable to the floating barge that she had been towing. The cable showed traces of metal from the hull of another vessel, suggesting that a submarine snagged the tow cable, pulling the tug under, in an incident similar to that of {{USS|Houston|SSN-713|6}} sinking the tugboat ''Barcona'' in 1989.<ref>{{cite web |url=http://njscuba.net/sites/chart_deep_sea.html#Hebert |title=Thomas Hebert |website=Scuba Diving – New Jersey & Long Island New York |accessdate=2013-07-07}}</ref><ref>{{cite web |url=http://www.tugboatdown.com/ |title=Tugboat Down – The Controversial Sinking of the Thomas Hebert |website=Tugboat Down |accessdate=2013-07-07}}</ref>
Other theories included a faulty steering caused the tug to turn so suddenly and sharply that it took on water at the stern and sank itself. Another theory is that due to a mechanical failure the tug steered itself in a larger circle in the middle of the night and was passed, then pulled backward and under, by the barge it was towing. The latter is an not uncommon accident in the marine towing industry known as tripping. An example of this happened May 11, 2001 when the 115' foot tugboat Bay Titan had her barge overtake her and pull her under while turning from the [[Delaware River]] to the entrance of the Chesapeake and Delaware Canal. <ref>{{cite web |url=http://www.professionalmariner.com/ |title=Crewmember drowns after barge trips tug |website=Professional Mariner |accessdate=2018-12-04}}</ref>
==References==
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