Basically every sea monster cryptid. There’s so much shit down there we don’t know about. Guarantee many many many of them are over exaggerated yes but there has been more than one case of a sea monster cryptid turning out to actually just be a real creature. Fucks me up

The ocean ones. There’s unknown big critters down there, it’s basically a statistical certainty.

I don’t think I’ve ever heard a believable one on land. People’s UFO and ghost stories can actually be hard to explain sometimes. All the cryptid stories are either very made-up sounding or some variant of “I looked and found nothing/got a super blurry photograph”.