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Last week, 10 million Optus customers woke to no phone or internet coverage.\\xa0

And then the problems dominoed from there.

Melbourne\\u2019s entire train network came to a screeching halt, and phone lines to hospitals were down. Some people were unable to call triple zero if they needed to.

For several hours, Optus\\u2019 CEO was also missing in action, and a two-line statement on the company\\u2019s website - that customers without internet couldn\\u2019t see - said Optus was \\u201caware of an issue\\u201d and was working to restore services \\u201cas quickly as possible".

Today, technology editor David Swan on getting to the bottom of what caused the 16-hour Optus outage ahead of the CEO\'s expected appearance before a Senate inquiry this week.

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