Hear the deepest sounds on earth, from the bottom of the Marianas Trench

It’s not everyday that you get to hear whats going on at the bottom of the Marianas trench, the deepest parts of the sea, and it may be a lot nosier than you think. Deep sea exploration is still an incredible new frontier, and with the help of technology we are learning more everyday.
A team of scientist from the National Oceanic and Atmospheric Administration (NOAA), the US Coast Guard and the Oregon State University have obtained the first ever audio recording from the bottom of the Marianas Trench 7 miles (11km) below the sea.
Unlike anything you’ve ever heard before, their deep eerie sounds reveal the deep moans of  whales and distance rumble of earthquakes. The recordings were made in an attempt to measure the amount of sound pollution in the Pacific Ocean.
We know that sound can travel an incredible distance underwater, and up to 4X faster than it does on land, and while diving it is always difficult to pin down the direction or origin of a sound. However we would have never imagines that 7 miles below the surface you could still hear the distance sound of a boat propeller and especially the sound of an earthquake.
Take a moment to listen to these recordings, as they are not like anything you’ve hear before. You can listen to some of the recordings below. [BBC]