As science unravels the great mysteries - the marvel of DNA, the origins of the universe and how Ronaldo manages to get his hair so greasy - it's comforting to know that there are still some things that science doesn't have the foggiest idea about.
Throughout the summer of 1997, an ultra low-frequency, unusually lengthy hum was picked up from the ocean.
The scientific verdict was that the recording matches that of an animal but one much, much larger than a blue whale, the largest animal known to man. To this day no credible answer has been given as to what, or who, caused The Bloop.
Enjoy your holiday snaps with 20 free prints from Snapfish.