Revealing mistake: As one of the lab crew is showing Tomas Jane the suspended tiger shark you can see a horizontal line in the water in the background. this is the edge of the water tank used to film the exterior scenes (mentioned in DVD extras).

Deep Blue Sea (1999)
61 mistakes
Directed by: Renny Harlin
Starring: Jacqueline McKenzie, Michael Rapaport, Saffron Burrows, Samuel L. Jackson, Stellan Skarsgard, Thomas Jane
Russell Franklin: Just what the hell did you do to those sharks?
Dr. Susan McCallister: Their brains weren't large enough to harvest sufficient amounts of the protein complex. So we violated the Harvard Compact. Jim and I used gene therapies to increase their brain mass, a larger brain means more protein. As a side effect the sharks got smarter.
Janice Higgins: You stupid bitch!
Trivia: Director Renny Harlin has a cameo as one of the employees of Aquatica who are leaving the facility for their weekend break in the opening scene.
Question: How did they do the scene when one of the sharks ate the bird? I know they used animatronic sharks for any interaction with the people, so did they use the same method for the bird? It was "inside" the shark after all.
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Answer: This was a CGI scene.
Ssiscool