If the battery is dead, there is a "Secondary Trunk Lid Release" mechanism. The primary is a switch next to the VDC switch.
The wording in the Owner's Manual:
"The secondary trunk lid release mechanism allows opening the trunk of the trunk lid in the event of a loss of electrical power such as a discarged battery. The handle is located on the back side of the trunk lid inside the trunk compart.
SEDAN: Access the handle through the interior trunk access hole (rear seat armrest). Return the handle to the original position by securing the latch. Otherwise, it may cause water to leak into the trunk.
COUPE: Access the handle from the rear seat. Fold down the rear seatback by pulling the strap, located at center bottom of the seatback sideways. To open the trunk lid from the rear seat, pull the release handle toward front of vehicle until the lock releases."[/quote]This is described (with pictures) in the Owners Manual.
Z