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I have the same fear. Despite every video game ever having almost no water monsters.
I can pinpoint the game and the moment I gained that fear. 9 years old. Super Mario 64. That dated looking polygonal giant eel. Tripped me up for years.
Probably a combination of jaws unleashed's black nothing once you get so deep + the shark from banjo kazooi + a lot of things
The shark from banjo kazooi is scary as fuck though lets just get that out there