Megalodon

In real life, Jason Statham is an expert swimmer. In the 1990 Commonwealth Games, he represented England in diving. Footage of him competing can be found online. Most of the shots of him in the water are real. A stunt double was used for more hazardous shots.

Owing to the general lack of sunlight at deeper sea levels, the Meg should realistically not be able to see at all as it surfaces, since the greater volume of light up there is much more overwhelming than what it's been accustomed to for millions of years. The book gets this right and has the important reoccurring plot-point that the Meg only surfaces at night because the sunlight hurts its eyes.

In the closing credits, the credits are seen sinking into the water.

Featured in Honest Trailers: Deep Blue Sea (2018)