Patlabor: The TV Series S01 E38 Underground Labyrinth Case

"This is a work of fiction...but in ten years, who knows?"

Something is out stealing stuff from Division 2. It appears to come from an old tunnel. Ota and Shinshi go to check it out. When Division 2 loses contact with them, Noa, Asuma, Hiromi, and Takeo go to find them.