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HOGAN 

 Water Depth: 144 ft. 

 Hydrophone Depth: 100 ft. 

 Distance: 100 ft. 



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HOPE 

 Water Depth: 132 ft. 

 Hydrophone Depth: 100 ft. 

 Distance: 100 ft. 



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 Water Depth: 120 ft. 

 Hydrophone Depth: 100 ft. 

 Distance: 100 ft. 



Fig. 8 Spectra of underwater noise of platforms Hogan, Hope and Heidi 

 superimposed on average deep water ambient noise spectra 



F-20 



