Two mainland workers died last night and another was fighting for his life after they were overcome by deadly fumes inside a floating dock at a Yau Tong shipyard.
On another black day for industrial safety in Hong Kong, the dead men were among four killed at work yesterday.
A 19-year-old engineer fell four floors to his death as he installed an air conditioner in Tai Po, while a 47-year-old man died in San Po Kong after plunging five floors when an excavator hit scaffolding on which he was working.
Last night's tragedy occurred when Cheung Ying-kwong, 38, entered the dock at Universal Shipyard Ltd to check whether it was leaking.
When he failed to come out, his colleagues Sze Cho-kui, 44, and Cheung Shu-yiu, 36, went to investigate.
A fourth worker, Wu Wing-wah, 44, alerted police after being overcome by fumes as he also went in search of the missing men.