Probably a silly question (SHB Final Zone spoilers)

[Noitems]

This has been on my mind for a while and I just wanted some clarification.

I know we use Bismark to bring us down to the Tempests (since he was the only way of transport to the ocean's depths).

What exactly is this whole process of us being able to breathe and function down there? It looks like through Bismark we actually breach this wall in the ocean (from the top) and land on the ocean floor with water dripping on to the floor from above and puddles of it on the ground. We can all breath (which I don't think is in relation to the Kojin's magic we had to breathe underwater in SB), and there's no actual water to float around so we can naturally just walk/run on the floor.

The Sahagin as well don't seem to have any issues either though I don't know if that's because we didn't break through the wall prior and it was just filled with water.

I love the zone completely and I'm pretty sure I was just blanked out watching the story unfold to piece this together. Was it ever explained in a sidequest or is just really an obvious thing they go over?

[RicaRuin]

It's explained when you ask Bismarck for help and also in some Ondo Sidequests.

Bismarck has the ability to create a massive bubble of air within the water by using his breath. So, what he did is use his breath to create a massive bubble filled with oxygen, that's the area we walk around in.

Since Sahagin/Ondo can live on land just as fine as in the water, it's not a drastic problem for them, but the air is causing them other troubles, as their sidequests will show you.

[Noitems]

It's explained when you ask Bismarck for help and also in some Ondo Sidequests.

Bismarck has the ability to create a massive bubble of air within the water by using his breath. So, what he did is use his breath to create a massive bubble filled with oxygen, that's the area we walk around in.

Since Sahagin/Ondo can live on land just as fine as in the water, it's not a drastic problem for them, but the air is causing them other troubles, as their sidequests will show you.

Well that explains a lot for that thank you for the explanation.

I guess that adds a bit of a time concern to the bubble (from an in game perspective) if water is slowly seeping through to the bottom of the floor. I'll have to make sure to do those sidequests to get more an understanding on the area. o:

[LineageRazor]

I think it's mentioned that the bubble will shrink and disappear over time - but from a gameplay perspective, that will never happen. In-game, the WoL has done everything they need to in there so s/he is likely fine with the effect going away eventually. It's probably kind of rough on the ecosystem, to be honest, so while it was necessary in the short-term, it's probably best to let nature take its course.