The NOAA Vents program of the Pacific Marine Environmental lab in Oregon has released some haunting sounds picked up by their underwater autonomous hydrophone array. Save the “Upsweep” sound for last for maximum spookiness!
Makes one wonder how much we really know is going on down there. Some of these must be sounds produced by the Earth as it groans its way through the tectonics.
Hat tip to @ElOceanografo.