Deep Blue Sea 3

Dr. Emma Collins leads climate-change research and shark conservation from Little Happy. She remains principled, resourceful, and willing to risk personal danger to protect her team and the ecosystem. She confronts mercenaries, struggles with past relationships, and ultimately safeguards her companions and the survivors.

Emma's ex-boyfriend who becomes entangled with the mercenaries and their dangerous plan. He reveals intelligence about the sharks and the beacon scheme, pushing the conflict toward a deadly climax. He is ultimately killed by a shark while attempting to join Emma.

Leader of Genotic Labs’ mercenaries, eager to kill and flee with the captured shark. He drives the eruption of violence on the island and coordinates the mine attack that endangers everyone. He is killed after Emma and allies thwart his plan.

A mercenary loyal to Lucas who fights Emma and the crew, ultimately meeting a violent end when a bull shark attacks during the final confrontation.

A member of Emma's research team, nicknamed Spinn. He is a capable, loyal ally on Little Happy, but falls to a bull shark in the island's deadly encounters.

Another member of Emma's team on Little Happy; a field-partner whose fate is not explicitly stated in the summary.

Emma's ally on Little Happy, resourceful and quick-thinking. She endures the fallout of the mission and is revealed alive after the island's destruction.

Nandi's brother and Emma's friend, who is killed by a bull shark while out fishing, underscoring the island's perilous climate.

Emma's friend and Bahari's sister, a resilient survivor who helps drive the escape and confronts loss with courage, accompanying Emma to civilization afterward.

Emma's father's best friend and father figure on Little Happy. He sacrifices himself during the battle with the bull sharks, using explosive darts to take down two of the threat.

A mercenary under Lucas who opposes Emma; he is killed when Sally, the protective great white, devours him during the climactic confrontation.