There's a sunken ship in the north sea, relatively deep down... I found it off the coast of a little island whilst on a Mage's quest to a hermit out there. I believe it's just to the west.
I was an Argonian, so I took my time looking around. Won't ruin it much more for you, though.
Thanks. I just went diving in the northern sea and checked that out. Despite the fact that underwater past a few meters out there's nothing more than the same repeated kelp plant, I found that diving in the far north was one of the two times the game felt legitimately "fantastic". Diving from the ice floes gave me a brief feeling that I might encounter something new and unexpected, unlike the rest of the game's trite, predictable slop.
The other thing that felt "fantastic" was
Still trying to figure out Bethesda's logic with the slaughterfish...
"Let's take away the player's ability to fight when swimming!"
"Yeah"
"And let's add an enemy that is only in the water, can attack a swimming player whilst they have no means to defend themselves and is a complete bitch to hit from the surface!!!"
"FUCK YEaaaaa....wait, whaat?"
Quite realistic though. Have YOU tried fighting underwater, or hitting a fish from above the surface? Takes a lot of skill.
You mean in real life?
Yeah, once I was swimming on the beach and a crab tried to pinch me, so I held my breath and tried to attack it with my sword but every time I dived after it the sword would sheathe itself for some reason.
I would suspect that they removed underwater wielding because they didn't want to have to animate anything other than the basic swim animation. If it were limited for the sake of "realism" we'd just get a heavy damage penalty to weapons that rely on inertia over sharpness. It would be cool to fend off aquatic monsters with knives
and spears. Magic is kind of screwed by the removal of all types of magic damage other than fire, frost, and lightning, though.
There should be a giant horker in the ocean, with a quest to hunt it.
I was hoping for an underwater dragon, perhaps with visual elements inspired by trench life or Paleozoic creatures. That'd be something to terrify the player. A skeletal-looking, armor-plated monstrosity with a mouth larger than the player, identifiable from a distance only by its bioluminescent glow would be a great deal more interesting than the generic Euromedieval dragons that get slaughtered by the dozen in airport novels.