When you heed to theabyss , the abyss listen back to you . young information reveals artificial and natural sounds can diffuse all the room to the bottom of the ocean .
For the first time , scientists have identify a titanium - case hydrophone on the sea flooring at the bottom of the Pacific Ocean’sMariana Trench , located about 11,000 meter ( 36,000 feet ) below ocean point . The hydrophone recorded ambient interference for over three workweek , with the results surprising researchers . The inquiry was carried out by the National Oceanic and Atmospheric Administration ( NOAA ) Pacific Marine Environmental Laboratory ( PMEL ) .
“ You would think that the deepest part of the sea would be one of the quietest places on Earth , ” Robert Dziak , a NOAA research oceanographer and chief scientist on the projection , said in astatement . “ Yet there really is almost unvarying noise from both natural and serviceman - made sources . The ambient sound field at Challenger Deep is dominated by the sound of earthquakes , both near and far , as well as the clear-cut moans of baleen whales and the consuming clamouring of a category 4 typhoon that just encounter to pass overhead . ”
“ There was also a spate of haphazardness from ship dealings , identifiable by the clear sound pattern the ship propellers make when they clear by , ” Dziak add together .
This is the sound of a baleen whale from the microphone
The aim of this subject area , which represent researchers from NOAA , Oregon State University and the U.S. Coast Guard , was to obtain accurate stochasticity measurement so that scientist can determine in the future if noise levels are increase . However , the depths of the sea are a especially hard area to study .
“ We had never put a hydrophone deep than a mile or so below the surface , so putting an instrument down some seven miles into the ocean was dash , ” said Haru Matsumoto , who helped acquire the made-to-order instrument for this experimentation . “ We had to drop the hydrophone wharf down through the pee pillar at no more than about five meters per second [ 16 feet per second ] . Structures do n’t like rapid change and we were afraid we would check the ceramic trapping outside the hydrophone . ”
Although the task was complex , the results were clearly worth the effort . Dziak and the rest of the team have examine the three - weeks ' worth of sound and have divide the instinctive noise and the noise made from human body process . The team are now design another expedition in 2017 , where they will keep the hydrophone submerged for a long period of time and sequester a thick - sea television camera .
A ship can be hear passing overhead in this recording
