I don't know much about the Sydney mines, but from the context, I can infer that the tunnels were unsafe. Whether being that they were collapsing, or they were filled with poisonous gasses.
The best answer from the choices provided chronological .
<h3>What is your chronological order?</h3>
Chronological order is recording, describing, or discussing when events occurred as they relate to time. It is like looking at a timeline to consider what occurred first and what happened after that.
<h3>What is a chronological report examples?</h3>
The chronological reports in newspapers, as they occasionally describe events as they unfold, putting each event in the order that it happened. Sports reports are a great example of this; they often represent a game or match from start to finish in time order.
To learn more about Chronological order, refer
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