Here's a 100-word description for Episode 4: The Siren's Call - Episode 4: "Rising Tide" Pursued through underwater caves by hostile sirens, Marina and Kai are forced into a vast underwater cathedral where Kai's people gather. There, Marina meets Nerida, Kai's sister and leader of the faction responsible for the disappearances. Nerida reveals their belief that humans have forfeited any right to the oceans through pollution and destruction.

To prove humanity's worth, she presents Marina with an ultimatum: witness a siren hunt firsthand as the research vessel Northern Star approaches with forty-seven souls aboard, or watch helplessly as they're called to their deaths. Marina chooses to leave the submersible's safety, donning an atmospheric diving suit to face the ancient predators of the deep.

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