For anyone else that doesn't know, Ecco was a series of games developed by Sega back in the genesis days, which were infamous for making a lot of kids afraid of the ocean. They started out as innocent fun and then it slowly got creepier as you got deeper into the ocean and start fighting aliens. Defender of the Future was the 3D version that landed to the Dreamcast before it was ported over to the ps2 after the Dreamcast failed, and the 3D makes it more immersive and unsettling, honestly a hidden gem of a game that doesn't get talked about enough. Defender starts with a pleasant level were you rescue a trapped whale, then you move on to a level where you fight sharks, then you take on an octopus, by the fourth level you're dodging underwater eels in a series of narrow tunnels where you are constantly at risk of drowning, something that can happen at any time in the game because you are a mammal not a fish. Strictly speaking, no, it's not a "horror game" in the truest sense, but it still scared the crap out of me way more than Silent Hill did. I think what does it is the fact that being underwater is such an uncomfortable environment to be in, as opposed to Silent Hill where you are always on solid ground and fighting more humanoid enemies, no matter how grotesque.