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Realistically, how logistically feasible would it be to fish very deep down in the ocean (lower mesopelagic zone to upper bathypelagic)?
If anything, I'd probably only pull up a couple of lanternfish, but even that would be exciting.
I already have a location in mind, and getting a boat there would be no issue. It seems risky to have a thin line dropping down that far, so I'd probably go with some kind of rope with a bit of line as a leader at the end. There's no way you would feel the pull of a fish at that distance, so it would have to be more of a wait and check operation.