The Suspect 용의자 - Gong Yoo (2013) - Causeway Bay Typhoon Shelter, Hong Kong

After quietly abandoning his enemy on board the wrecked ship in the harbor, and knowing that he has been abandoned on his mission, Ji Dong-chul (Gong Yoo) does a runner, well a swimmer really. This brief scene, shot in the typhoon shelter shows him making his escape by swimming away. After this he is recaptured by the North and tortured whilst learning about his family being killed. There is a brief snippet of him swimming away, but something tells me it wasn't filmed here and was most likely added later from the comfort of cleaner water.