The death of a 43-year-old man who was crushed when an 800 kilogram concrete soakwell lid fell on him during work on an apartment complex in WA's Pilbara region was "the final and fatal link in a chain of errors", an inquest has heard.

Robert Stephan Hamiora Serjeant had more than 25 years’ experience as a qualified rigger and had been working on a fly in fly out basis at the Pelago West development in Karratha in July 2011 when the accident occurred. As the soakwell lid was lifted by a crane onto a…