While the search operation continued, a probe team will be sent to the site of the incident Guangyuan City of Sichuan Province, the State Administration of Work Safety said on its website.
The administration also called on local authorities in Sichuan Province to launch water transport safety inspections, improve the management of sightseeing boats, remove possible dangers and prevent major accident.
Earlier, authorities suspended operations of all tour boats and ships following the accident.
The 40-seater leisure boat carrying 18 people capsized in Bailong Lake amid strong gales yesterday afternoon in Guangyuan City of Sichuan Province. Three survivors who were pulled from the lake remain under observation at a local hospital.
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The boat 'Shuanglong' is owned by a local ship company, according to Lizhou District maritime department, where the accident occurred.
Blue Sky Rescue, a civilian group made up of outdoors experts, found the capsized boat today from a locating device and underwater cameras, however, there were no sign of life.
"The boat had sunk to a depth of 65.1 meters. Underwater robots will be sent to assist the salvage tomorrow," Li Xiang, a rescuer with Blue Sky Rescue, said.