“Worst ever” and “unprecedented” have become the new norm this bushfire season, but when a blaze grows to the size of Sydney a new standard of overwhelming is set and firefighting becomes a logistical headache.

Five blazes merged north of Sydney on Friday and the term “mega-fire” reared its ugly head.

The 60-kilometre fire front continues to consume areas west of Gosford, including Colo Heights, Wollangambe, Mellong, Wollemi and Big Yengo.

But how exactly does the Rural Fire Service (RFS) fight a fire this big?

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