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Golf Courses can be hazardous to divers.
http://www.underwaterindustry.com/news/articles/261/1/Golf-Courses-can-be-hazardous-to-divers/Page1.html
By  UnderwaterINDUSTRY .com
Published on 05/23/2005
 

The retrieval of golf balls from golf courses must be carried out with the same attention to detail and care as any other diving operation. Over the last couple of years, divers have been killed in golf ball recovery operations. Don't take the job lightly - find out how divers in Ontario (or elsewhere) should operate when conducting dive operations on the way to the green.