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The Messy Abyss was a 1st April Fools joke made by developers in one of the Content Drops, in the form of a "sneak-peak" to the biome, which was supposedly going to be added to the game at a later date. All that was shown was a poorly-made joke image, depicting an enormous Trash Crab emerging from a body of mud and trash.
(ADD A PICTURE! LINK HERE : https://steamcommunity.com/games/307110/announcements/detail/1747867544669036260 )