Following the events of the first movie, Meg 2: The Trench followed a similar premise, featuring the appearance of creatures once thought to be extinct — megalodons. As teased at the end of The Meg, the sequel, directed by Ben Wheatley, revealed that more than one megalodon escaped the Mariana Trench, which meant that Jason Statham's action hero, Jonas Taylor, was forced to come face to face with the gigantic beasts once again after killing one in the first film. Unfortunately, this time, Jonas and his team had to take on more than one megalodon, meaning that principal photography was extensive and took place in numerous locations.

https://screenrant.com/meg-2-trench-filming-locations-explained/