Emma Collins and her team are on their third summer researching the impact of climate change on great white sharks at Little Happy Island, where they give birth near a nearby nursery. Their peaceful life is disrupted when a new team, led by Emma's ex-boyfriend Richard, arrives to search for three bull sharks with a sinister purpose.

Deep Blue Sea 3
As scientists in Mozambique delve into the impacts of climate change on coastal ecosystems, they stumble upon a sinister discovery: genetically engineered bull sharks, posing a catastrophic threat to humanity's well-being.