They told me it's pretty simple- the baby gets the oxygen through the placenta.
Fish are capable of breathing in water, but humans breathing through liquid stuff?
I don't know why enough people aren't curious enough, and don't know what scientists are doing about it. But if I were a scientist or VC in the biotech field, I would look into it.
Here's the basic idea:
Figure out how the human baby is capable of breathing inside the mother's womb, getting oxygen from the placenta. Then we create a placenta pouch that will be connected to your belly-button (or wherever appropriate). Fill up your nostrils and lungs with water (or whatever liquid necessary) just like the human baby does, and dive into water!
You can now breathe inside water! How long you can breathe underwater would depend on the Placenta Pouch you buy ...
Watch out for the launch of Placenta Pouch from Belly Button Corporation (BBC)!