On Monday afternoon of November 16, 2009 (1611 hrs local time), the regional NOAA Scientific Support Coordinator was notified by Marine Safety Unit Port Arthur of a mystery slick observed roughly 10 nautical miles S of Cameron Parish Louisiana. The location was reported as West Cameron Block 73. The source of the release was unknown, but was reported as a silver sheen 300 yds wide by 6 miles long.

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Note: Documents are posted chronologically and early reports likely contain factual errors. These errors may be corrected in a later report.