What happened

A stress-related failure ruptured Santos's Big Lake gas pipeline in the Cooper Basin, releasing an undetermined quantity of natural gas. Santos said its operations team stopped the release and prevented further inflow, repaired the line in about a week and then spent another fortnight testing and inspecting it. South Australia's Department for Energy and Mining was notified and required a detailed investigation report. The event was not publicly reported when it happened and became public through April reporting around Santos's annual general meeting. The state energy minister said there were no injuries, environmental damage or liquid spills and defended the decision not to issue a public notice because regulators had been informed and no external impact had been identified.

When cited sources give different casualty, damage or spill figures for this event, they’re reported side by side above rather than merged into one number. See how confidence levels work.