How did the people die during the Sydney harbor Brudge's Construction?

By falling into the water and dying 9 died by that

1 fell but survived because he dropped his tool belt which broke his fall another was killed by the cement or something like that when the crain was moving stuff on the bridge the chain snapped from the heavy load the guy lost his leg and sadly it took to long to get off the bridge and the guy died i dont know what happen to the other 5