What is the name of the movie with two scuba divers that are abandoned at sea?

A couple on a holiday in the Caribbean decide to spend the day on a
scuba diving trip. But was it the wrong decision? When a mis-count
happens on the boat, Susan and Daniel are left behind in the middle of
the ocean, the boat long gone. With all their hopes set on the boat
coming back to rescue them, they try to keep themselves safe,
especially when sharks start to appear.