Aston Martin DB11 Owner's Handbook Manual page 38

Open the door handle and insert the emergency key in the door
lock and turn clockwise. Only that door will be unlocked. If the
security system was armed, the alarm will start. To stop the alarm
insert the vehicle key (even if the vehicle key has lost all power)
into the emergency ignition slot and move to position 'II' (ignition
ON).
Caution: If the vehicle has lost power, the door may
require extra effort to open due to the window not dropping
down. If this does happen, gently press against the top of the
window whilst opening the door.
Caution: If the vehicle battery is fully discharged, the
emergency key will only lock or unlock the left side door. The
right side door can be unlocked from inside the vehicle, but
unless power is supplied to the vehicle, that door cannot be
locked again.
Even if the vehicle key has lost all power it will start the engine
when used in the emergency ignition slot.
2.12
Vehicle Security
Emergency Deck Lid Release
The deck lid can be opened from inside the luggage
compartment by pulling the luminous emergency release handle
(A).