why did the boat leave in 47 meters down
47 Meters Down Lisa (Mandy Moore) and Kate (Claire Holt) are sisters on vacation in Mexico. Lisa's boyfriend broke up with her because "she made the relationship boring". Kate tries to cheer Lisa up and takes her out drinking and dancing at 4:00 am. The sisters meet a pair of local men at a bar and they convince them to go out with them on their boat to watch sharks from a diving cage. Lisa hesitates but Kate persuades her saying it would show Lisa's boyfriend that she isn't boring and make him regret breaking up with her.