A major shareholder of Heliservices (the Kadoorie family) is also a major shareholder of CLP. CLP has faced very significant safety issues before (prolly not through any material fault of their own, as power generation and transmission have inherent risks) but I do recall they fell out badly with their own lawyer over a previous fatality at one of their power stations - the lawyer seemingly felt obliged to disclose things told to him in confidence and got his a*se sued off him.
I hope CAD investigates this very thoroughly, without fear, favour or affection, and wish the injured men a speedy recovery.