First, let's get through the nasty part here. I did use the search function and found multiple things about breathing underwater, but most of the threads we're poorly thought out and/or used way to many , so let me try to present this idea in a clear, understandable, and balanced way.
We already have a underwater breathing tool, the QSuit Helmet, however this is expensive. I'm thinking of an item that is disposable, like rubber boots. So, let's get into the fun stuff. I think there should be an item, let's call it the Rebreather, that let's you breathe underwater similar to a QSuit. I think it shouldn't last much longer than five minutes, but it should be used whenever you are underwater, not just when you need it. After going for five minutes, it should *Poof* and disappear. Obviously the numbers are just ideas, and could be changed around for balance. I think a good time it should be available is about when you have an MFE, and just a limited source of power.
(C) C = Carbon fiber or mesh.
(R) (R) (R)
(R) (C) (R)
R = Refined Iron C = Carbon fiber or mesh
Obviously, these are just ideas, and if you have any on the topic, let me know. Also, if you think that this is UP or OP, then let me know, as well. All in all any input is appreciated.