Whos up for a swim? Welcome to WatchMojo, and today were counting down our picks for the weirdest and most fascinating ocean-related mysteries. Our countdown of deep sea mysteries that will freak you out includes The HMS Daedalus Sea Serpent, Gulf of Mexico Shipwreck, Gulf of Khambhat Ruins, Colossal Squid, The Megalodon, and more! Which deep sea mystery do you find the most intriguing? Let us know in the comments below.

Watch more great mystery videos here:
Top 10 Creepiest Mysteries of All Time: https://youtu.be/1NtkmJ8mCeE
Top 10 Creepiest Mysteries That Were Finally Solved: https://youtu.be/AppQnVjjQ54
Top 10 Creepiest Mysteries About the Middle Ages: https://youtu.be/WGfgOimvLlw

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#Mysteries
#Ocean
#DeepSea
#Mystery
#Creepy
#Scary
#Fish
#Underwater
#History
#Nature