Underground car graveyard

This is what we saw inside an abandoned tunnel, nothing is know about the reason, I guess it’s was just a hidden car graveyard.
car graveyard 01 car graveyard 02 car graveyard 03 car graveyard 04
car graveyard 05 car graveyard 06 car graveyard 07 car graveyard 08
car graveyard 09 car graveyard 10 car graveyard 11 car graveyard 12