Loudest Sound Ever?

      I'd have thought the Big Bang, but: how could there have been a big, "Bang" in a vacuum?

     The loudest sound in human History was (officially) the third Krakatoa explosion/eruption.

               https://allthatsinteresting.com/krakatoa-eruption

                                 Clocked in at 310 dB

                  Energy equivalent to 200 megatons of TNT.

@onhwy61-  Scientifically speaking: shockwaves and sound waves are two distinctly different phenomena.

    A shockwave resulting from an energetic enough explosion, can travel 100 times faster than the speed of sound.

    A shockwave's wave-form also differs from that of sound, as does how it affects the surrounding gas.

                    ie: https://fas.org/sgp/othergov/doe/lanl/pubs/00326956.pdf

    However one defines it: the sound of Krakatoa's eruptions were heard 3000 miles from the source, on Rodrigues Island.    

                                                        What a blast!

        "Technically the conditions prior to the Big Bang are undefined."

                  Factually: no one knows the Big Bang happened.

                         That's why it's referred to as a, "theory".
 
              ie: Hawkings works = Theoretical Cosmology/Physics.

https://www.newscientist.com/article/2053929-a-brief-history-of-stephen-hawking-a-legacy-of-paradox/ (RIP)