In the last hours of 2019, David Finnigan's best friend prepared to make a break for home with his family before fires cut off the highway.

As Australia was hit by the worst fires in the country's recorded history, an area the size of England burned and one billion animals were incinerated.

Written over the last three days of the decade, as David's friends and family raced to evacuate amid the devastation, Deep History is the story of 75,000 years of human history and 75 hours of brutal consequences.