How to get Abyssal and Hadal fishing rods in Dredge

The Dredge Abyssal and Hadal fishing rods are unique in that you can't initially unlock them by using Research Parts like any of the other rods, nets, or pots in the game. Instead, you have to complete a very specific pursuit in order to unlock Abyssal fishing so you catch some of the deepest and rarest fish in the game...
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