Syrena kissed Philip, confirming the legend that a mermaid's kiss prevents drowning by giving him the ability to breathe underwater, and pulls him into the pool. Philip was taken by Syrena as they swim through the pools to freedom. His further fate is unknown.

Why did Syrena help Jack?

Why did Syrena come to the Fountain at the end to give Jack the chalices? ... She's probably pulling a minor Batman Gambit to ensure Jack tricks Blackbeard into killing himself with the chalices. Jack was also the only other person who was concerned for her when she was suffocating.

Does Philip Love Syrena?

During the journey, Syrena fell deeply in love with Philip, who she thought was different than the other crewmen, being a protector. It was Philip who gave the mermaid her name of "Syrena", in order to make the pirates see her as a person and not a creature.