UFO News Article:
“UFO takes to swimming?”, 
9 November 1973
(St. Joseph Gazette, Missouri)

Two brothers, Raymond and Rayme Ryan, sighted a self-luminous underwater object in the Pascagoula River, Pascagoula, Mississippi on 6 November 1973, according to the article:

http://news.google.com/newspapers?id=whldAAAAIBAJ&sjid=e1oNAAAAIBAJ&pg=2557,3805395

The unknown object followed their fishing boat.

The U.S. Coast Guard confirmed Raymond Ryan’s report.

Satellite photo of Pascagoula, Mississippi (tageo.com)
(tageo.com photo)