Maciolek asked about water depths where the most significant impact 

 occurs; it appears to be around 100 m on the Middle Atlantic shelf, 50 to 

 100 m in the North Sea. Ray described experiments at 35 feet and 75 m in the 

 Gulf of Mexico that showed no significant impact. There is no information on 

 possible impact at significantly greater depths, 500 m or more. 



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