Is there a gel like substance that enables navy seals to breathe underwater when ingested and coats the lungs?

I saw it on the history channel three years ago. It was a show about navy history and included some new technology as well. I was hoping to hear more about it in the future, but it has been three years and I have no further information about it other than the fact that it was developed by the navy, is currently being used by SEALS, and allows the user to absorb oxygen into the bloodstream through the inhaling of water into the lungs. the lungs are coated by the substance and before the user can breath normal air again they must vomit the gel out of their lungs. I would just like to know the name of the substance.