Who's up for a swim? Welcome to WatchMojo, and today we’re 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 Become a channel member to get access to special perks: https://www.youtube.com/channel/UCaWd5_7JhbQBe4dknZhsHJg/join Don't forget to play our Live Trivia games at 3pm EST for a chance to win cash! The faster you answer, the more points you get!: https://www.watchmojo.com/play Have your idea become a video! https://wmojo.com/suggest Subscribe for more great content! https://wmojo.com/watchmojo-subscribe Visit our shop for awesome merch! https://shop.watchmojo.com/ Your trusted authority for Top 10 lists, reviews, tips and tricks, biographies, origins, and entertainment news #Mysteries #Ocean #DeepSea #Mystery #Creepy #Scary #Fish #Underwater #History #Nature