省港旗兵第四集：地下通道
(1990)
Director:
Michael Mak Tong-Kit
Writer:
Johnny Mak Tong-Hung
Cast:
Elvis Tsui Kam-Kong, Chan Ging, Ronny Ching Siu-Lung
The final entry in Michael and Johnny Mak's Long Arm of the Law series, Underground Express once again tells a story of gangsters versus police, focusing on the difference between how both factions act depending if they're coming from Hong Kong or Mainland China.