More than two dozen crew on an engineering vessel with 30 people on board are missing after the ship snapped in two in waters off Hong Kong as tropical storm Chaba passed through.
Three crew members were rescued, and searches are continuing for others about 300km southwest of the city, the Hong Kong Government Flying Service said.
Some of the crew had abandoned the vessel and harsh weather conditions were hampering rescue efforts, they said.
Chaba skirted the global financial hub, bringing heavy rain and wind, restricting public transport and forcing many businesses to close.
Hong Kong's weather forecaster lowered the storm warning to signal No.3 on Saturday afternoon, with Chaba making landfall near Zhanjiang in China's Guangdong province.
Authorities in Hong Kong raised the typhoon warning on Thursday just as Chinese President Xi Jinping arrived in the city to commemorate the 25th anniversary of its handover from Britain to China.
Australian Associated Press
Sign up for our newsletter to stay up to date.