Cape Town marine biologist Kate Mathieson (Halle Berry) is so in tune with her subject she's known as the "shark whisperer". However, after an attack which left a fellow diver dead, she has been haunted by the experience and never gone back in the water. With bills piling up and bailiffs threatening her boat, ex-hubbie Jeff (Olivier Martinez) presents her with a lucrative opportunity to lead a thrill-seeking millionaire businessman on a dangerous shark dive... outside the cage.
It's pretty much received wisdom that "swimming with sharks" is not the safest aquatic pursuit.
Yet, this is where Halle Berry's marine biologist Kate made her kruggerand, diving into the deep with Great White Sharks off the coast of South Africa.
At least it was until a particularly moody marine predator tore chunks out of her trusted fellow diver (Sizwe Msufu) literally making him fish food.
Traumatised, she now earns a crust offering cruises from her old tub of a boat...until the bailiffs threaten to take it away as the debts mount up.
Salvation comes in the form of boorish British film mogul Ralph Brown, who wants to take his son (Luke Tyler) on a shark dive...while swimming outside the safety cage. Bad idea...especially with a storm brewing.
Director John Stockwell (Into The Blue, Blue Crush) has a track record of filming on the briny and the cinematography in this ocean-going saga terrifyingly captures the constant threat of marauding sea beasties.
Berry gives her all in a role that requires her to - or at least what looks like - literally swim with sharks and Brown gives good slimy villain as her money-no-obect client.