Chinese authorities have uncovered a tunnel from the mainland to Hong Kong, apparently built by smugglers.
The tunnel, with concrete walls and interior lighting, started under a garage near the city of Shenzhen and stretched for 40m (130ft) under a river and into reed-beds in Hong Kong.
The authorities believe gangs intended to use it to import mobile phones and other electrical goods into Hong Kong.
The semi-autonomous zone has different tariffs to the mainland.
The smugglers could make huge profits by avoiding border fees and taxes.