I went looking at past threads on this topic and there was an interesting tidbit here: https://forums.elderscrollsonline.com/en/discussion/150813/underwater-swimming(Quote)
I'm trying to think of a game that had an underwater zone that wasn't awful. <img class="emoji" src="https://forums.elderscrollsonline.com/resources/emoji/neutral.png" title=":|" alt=":|" height="20" />
I am pretty sure I recall Zos stating there are challenges and limitations for going underground due to the engine. Swimming underwater is pretty much underground.
Let's be real - they can't get this game's engine to run even remotely fluently in its current state. Adding underwater mechanics would just be the final nail in the coffin to a game that, from a tech
GW2 has an under-developed underwater.. they didn't do much with it though besides some zone quests here and there and a swmming area in that resort-type tow. WoW has underwater bits. FF14 has a prett