Update on continuing progress in my wonky world: Good news: After many weeks of exploring the Black Forest, I found the merchant! Bad news: He's on the bottom of the ocean floor

Now that also happened with the first Elder summoning altar we found but fortunately we found another one on land to use. For the vendor, though, I fear this might be a game breaking situation as I understand he spawns ONLY in the first location you uncover. Is that correct?

Perhaps a vain hope but maybe I can raise him from the sea floor somehow? He's not too far off the coast (eyes hoe speculatively).

Anyhow, your thoughts appreciated!