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Bloop was an ultra-low-frequency and extremely powerful underwater sound detected by the U.S. National Oceanic and Atmospheric Administration (NOAA) in 1997. A fiction TV show in the form of a documentary titled Mermaids: The Body Found used the bloop sound as evidence for the existence of mermaids or an unknown species in the oceans. 2  NOAA posted a refutation on their web site.
The first sound (the lub of lub-dub) is the sound of the mitral and tricuspid valves closing. The second sound (the dub) is the sound of the aortic and pulmonary valves closing. Each heartbeat has two parts: diastole and systole. During diastole, the ventricles relax and fill with blood.