There is no light in the depths so the guys don’t see they are mating with ugly girls. Evolution does the rest…
Joking aside, there is no need for any creature to look pretty to us. In this particular case, nobody bothers to print or talk about mundane-looking animals. They are boring. Whatever you have seen as a person who doesn’t really have a clue about marine biology is something that passed through a very high threshold of being interesting enough for mass media. This means extremes, like monster-like ugliness.
This is called selection bias.
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