If a vehicle falls into deep water and begins sinking, what is the most effective method for occupants to escape if the doors cannot be opened due to external water pressure?

1. Wait patiently in the car until it sinks to the bottom and water fills the entire cabin
2. Try to kick through the laminated front windshield with your feet
3. Turn on the air conditioner at full blast to equalize cabin pressure
4. Use an emergency window breaker or the metal prongs of a removable headrest to smash the corners of a side window and escape (破拆侧窗四角逃生)