Robert Kaluza along with co-defendant Donald Vidrine, who US prosecutors allege misinterpreted key tests on the British supermajor's fateful Macondo well, petitioned on Friday to have the 11 counts each of manslaughter and seaman's manslaughter dropped, according to court documents.

Attorneys for the men argued that the Marshall Islands-flagged craft from the Swiss Transocean rig contractor was "a foreign owned, foreign flag vessel located 48 miles offshore in the Gulf of Mexico— far outside US territorial seas," the filings asserted.

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