How the heck are you supposed to beat Lud's Gate in NG+?!

[PhoenixSword24]

For the life of me I can't figure out how you're supposed to do the underwater section of Lud's Gate without getting air (since the spot is now filled up from the start).

Even using Photo Mode to scout ahead and pick the right path doesn't help give much time.
I could save repeatedly to get health back up, but that will deplete all my resources rapidly.

The only other thing I can think of is the infinite breath glitch, but I'm going for the NG+ achievement and don't want to be locked out of it after struggling this far (I've only got Antarctica left after London).

[Lanzagranadas]

I did Lud's Gate NG+ without healing. The scuba drivers were a pain to deal with, but I didn't see any difference with the water itself. https://www.youtube.com/watch?v=EjBypTqxIc4

I took the "safer" route though (no embalming fluid). I don't know if NG+ changes something specifically in the embalming fluid route.

[Hassbrow]

I read on Stella's about using the UPV in the ceiling to clip into air. It's a little fiddly but works ok.

[PhoenixSword24]

Thanks for the advice.
I'm thinking of just using the UPV Infinite Breath glitch and if it won't let me get the achievement, then I'll reload and try to do the shorter route and just hope I won't need the crystals.

I've been getting every secret as well, but I'd rather get the NG+ achievement than play All Hallows.