The waters just outside of Hong Kong offer divers some extremely rewarding and challenging dives, in order to develop and cater for the growing number of technical divers in Hong Kong, TDHK and Mandarin Divers has a custom made 34ft speed boat capable of taking Technical Divers out to dive sites such as Pedro Blanco and the Oil Rigs in the South Chinca Sea. With this capability, a variety of Open Circuit and Closed Circuit courses are available to Hong Kong based divers that previously were not readily achievable.