The Operatives set out on a covert night mission to bust alleged illegal fishermen using highly destructive cyanide fishing methods in the Philippines, while Nicola learns how marine rangers protect the pristine Tubbataha Reef in the Sulu Sea.

The Operatives target alleged illegal foreign fishing vessels suspected of pillaging reefs in the South China Sea, while Nicola travels to Hong Kong to explore the daily catch at one of the city's largest fish markets.