User blog comment:MeDeoPal/Syrena/Philip Subplot/@comment-184.38.14.95-20110617151658/@comment-4898132-20110617220837

All we know is that she kisses him, thereby healing him and giving the ability to breathe underwater. As to what happens after they swam away together, is unknown...but it may appear in the possible Pirates 5.

Hope this helps. :)