In the highly believable-ish Sharks in Venice (aka, Shark in Venice/2008), David’s archaeologist dad was diving under Italy’s famous waterlogged city, looking for the fabled Medici treasure, when he was attacked by a great white shark. This resulted in him not being an archaeologist. David and his girlfriend go to Venice to find his missing dad. (Hey, David — start with the shark’s litter box and go from there.)
Criminals are also in search of the fabled Medici treasure, which is hidden somewhere under the permanent high tide that surrounds Venice. They’ve already lost a member or two of their organization to the sharks. I bet they tasted gamey.
David goes diving for clues as to his dad’s last moments, and ends up being attacked by a shark of all things. He survives a shoulder bite and in the process, finds the treasure. Criminal logic dictates that by kidnapping David’s chick, they can force him to lead them to the booty. The Venetian polizia have been trying to bust those mean criminals, and move in.
Some weak fist fights and motorcycle chases eat up time until the sharks get their moment to chow down on tourists or “foreign food.” The swimming mouths are not shown chewing into human swimsuits, but there is a lot of splashing and red stuff, maybe in the water. As this takes place in Italy, I presume it to be some sort of tangy tomato sauce, used in a wide variety of pasta dishes and for bread dipping.
So how did great white sharks end up in Venice? Expedia.com™ was running a promotional travel sale that week.