A Hong Kong man died yesterday on a diving trip with friends off Wailingding Island in mainland waters. Chan Sik-poon, 48, set off with eight friends after they hired a boat in Pak Sha Wan, Sai Kung, at 8.30am. The accident happened about an hour after they arrived off Wailingding Island, about 16km south of Lantau Island, at 10am. The location is a favourite spot for line and spear fishing. Chan was under the water and in full diving gear at the time of the incident, police said. 'The man's diving shoes came loose under water. He developed a problem after his [diving] partner failed to help him put on the shoes,' a police source said, adding that the cause of the death was still being investigated. 'His partner and friends then helped him resurface and got him on the boat.' Heading back to Hong Kong, they called a woman friend, who called police at 11.50am. Chan was conscious at first but lost consciousness before the boat arrived at a Cheung Chau pier at 12.30pm. He was taken to hospital, where doctors declared him dead at 1pm. Police said they had found no suspicious circumstances. Chan lived with his family in Mei Foo Sun Chuen, Lai Chi Kok. The site of yesterday's incident is favoured by many divers, according to Hong Kong Aquamen Association chairman Leung Kwok-wing. 'It is for experienced divers, not beginners, as there are strong currents in the area,' he said. 'There is also a potential danger for those who are not familiar with the area.' Mr Leung said divers should stay close to their partners, remain calm and seek help from their partners if they got into trouble under water. Diving Adventure course director Au Sui-kin said divers should be equipped with a first-aid kit and satellite telephone if they went diving outside Hong Kong. Last month, bar owner Bjorn Lohse, 51, who owned Le Jardin in Lan Kwai Fong, died when he went diving near his yacht off Lung Ha Wan in Sai Kung. In 2001, 35-year-old trainee scuba diver Cheng Lai-ham drowned off Tsim Chau in Tai Long Wan while taking diving lessons. A year earlier, father-of-two Keung Shue-hung, 50, died after he became trapped under a boat submerged in 20 metres of water.