What happened?

During barge operations at a spool fabrication yard, a high potential near miss occurred when a gangway positioned between the quayside and barge fell 2.4m, landing on the barge. At the time of the incident, there were no personnel in the vicinity of the gangway. However, only minutes earlier, personnel had been using the gangway to access the barge.

What went wrong ? What where the causes ? Read more here.