Who's up for a swim? Welcome to WatchMojo, and today we’re counting down our picks for the weirdest and most fascinating oceanrelated 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.

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