If you look down at those icky things, won't your fear just turn into loud screams and running out of the ocean?
I used to surf with some guys I knew in the navy. One of the places we surfed was some little fishing village on the coast of no where's ville. I'm out there trying to catch a wave of any kind, it's cold, it's raining, I'm miserable as fuck and pretty much shivered the buzz I had off. Then I felt a little tickle on my foot. As I looked down I noticed something crawling up my leg and coming up out of the water. It looked like a giant scorpion mixed with a fucking octopus. I freaked, shrieked like a little girl, backhanded the mini Cthulhu off of my upper leg, caught a decent little three footer and noped the fuck on back to shore. I didn't go back in that water ever again in Japan. Ever...
Ya, I figured out it was some sort of face raping alien bastard hell bent on having his way with my throat hole. That was as far as I needed for it to go... No, I never did figure out what it truly was.