Sooo, not that I expected a masterpiece with this movie but the main thing that bothered me was supposedly the 2 sister's father discovered this underwater city and has been working ( unsuspecting of sharks) for a number of days. So ...your telling me there is a whole team of men working under water for days and never have a problem with sharks until the girls arrive.. at which point the sharks decide to become frenzied relentless killers despite the fact they have eaten half the crew.... oh ok.. smh