Real-life thriller Open Water has gone straight to the top of the UK box office in its opening week, taking just over £1.9m.
The actors spent 120 hours in the water during filming
The film is based on the true story of two scuba divers accidentally stranded in shark-infested waters after their tour boat left them behind.
Steven Spielberg's The Terminal, starring Tom Hanks and Catherine Zeta Jones, dropped to number two.
Anchorman and Wicker Park were the other new entries in the top 10.
Retro comedy Anchorman: The Legend of Ron Burgundy, went in at number five, taking £0.5m.
Romantic thriller Wicker Park, starring Josh Harnett, entered the chart at number eight, with takings of £0.3m.
TOP FIVE UK & IRELAND FILMS
1. Open Water
2. The Terminal
Source: Screen International
Super Size Me, which follows a film-maker as he eats only McDonald's fast food for an entire month, just missed out on a top 10 place in its opening week.
The film is at number 12 but only opened at 82 cinemas - most "big" films appear on between 250 and 450 screens across the UK.