I have a 1993 325 BMW and cant get the trunk open.

I have a 1993 325 BMW and cant get the trunk open. The button on the trunk lid just moves in/out freely. There isnt a lever on the inside to release the trunk. Of course the battery is dead now. I can reach the lock through the scuttle hole in the back seat with a long screw driver but dont know how to release the lock mechanism. I have called many dealers in the area but of course get the brush off. I never heard of a car not having a release lever or button inside the car......But I cant find one. I have checked the fuses- all seem ok. I have tried the master key...nothing works..Any help would be greatly appreciated.