In a boat “fight” between New Jersey and New York, the dead body of a man who went diving is found lying in the water. But when Hawkes uncovers that the victim apparently lost oxygen and drowned with a full tank and a back-up, Sid finds out that a starfish was in the victim’s body, eating on the internal organs. Meanwhile, Danny and Hawkes go underwater to find evidence where the victim died, but when Hawkes gets stuck and Danny has problems freeing him, Hawkes’ life is put in jeopardy.