When Dr. Emma Collins and her team are on Little Happy Island studying the effect of climate change on great white sharks who come to the nearby nursery every year to give birth, their peaceful life is disrupted when a "scientific" team shows up looking for three bull sharks. It is the third and final installment of the Deep Blue Sea film series, and a direct sequel to Deep Blue Sea 2.

References:
https://en.wikipedia.org/wiki/Deep_Blue_Sea_3