Mechanical keys can be used.
The car key does not respond to the car key battery may be out of power or signal interference near the airport, wireless transmitter station, in addition, the vehicle has no fuel or electricity may not respond, the anti-theft system can not be unlocked after being activated, you can use the mechanical key on the remote control key to open the door. For the damage of the remote control key after it is soaked in water, it is generally not possible to repair, it is recommended to match a new vehicle key and disable the old key.