Potential Leviathan (Ocean monster)

The idea of massive ocean monsters has been around us all the time. It is one of the oldest running stories and bibles. In 1.13 (or sometime around then), Mojang added a sound to Minecraft titled "Dark4". Now there are variants of these sounds in the game, such as "Dark1", "Dark2", and "Dark3". These sounds are typically heard in caves, but are most common in the minecraft ocean. Now I have no idea if Dark4 plays on minecraft bedrock, but the sounds define a large ocean monster, potentially a leviathan. It would be rather lovely if Mojang added a sea monster tied to these sounds, if I had to define it, I would put it in the following words: A large fish with 3 fins on the back, stretching towards its tail. It has a fluke, red, blue, or golden glowing eyes, varying on biome it's placed. It is a dark, grey-ish blue colour. It is highly aggressive (as shown in looks). It is overall an aggressive whale-like sea monster. It is 75 meters/blocks in length, 15 blocks wide, and is 30 blocks in height. However, it size varies. The defined scale is when it spawns in the deeper parts of the biome 'Deep Ocean'.  The creature has the same amount of hearts as the warden, deals 30 damage, which instantly kills a player with no armour and/or protective items. The name of this "mob" is "The Dark Leviathan". The spawning of this creature is 1 in 1,000 chance, only spawning in biomes with deeper bottoms.