Dramatic footage has emerged showing the moment a Mexican Navy helicopter plummeted into the water.
One person is missing and two were injured in the crash, which happened in the Gulf of Santa Clara, according to reports.
A further nine people were unharmed, it is understood.
The MI-17 chopper was patrolling the area in order to combat illegal fishing, El Mexicano reports.
Several fisherman rushed to help the stricken crew after the helicopter hit the water.
Two injured people were taken to San Felipe for medical treatment.