The special features section of the DVD chronicles how much of the film was filmed as live action shots in the sea off the Bahamas, with live, wild sharks. It shows film crews wearing chain mail as protection whilst the cast perform in the water unprotected. The filming was made possible by the development of
shark tourism in the Bahamas. The sharks are used to being hand fed and will not generally attack humans but as a result will grab any item that "hits" the water as potential food. In an early scene Paul Walker has to grab two
fins and a dive mask flung to him by Alba. During filming he missed the mask. It was never seen again after hitting the water and the DVD suggests that it was taken by a shark.