Crawling through darkened caves and squeezing between narrow rock crevices in rugged terrain - police say nothing will stop them from bringing Australia's most wanted man to justice.

As the hunt for accused cop killer Dezi Freeman enters its third week, police have shared a rare glimpse into the manhunt.

Victoria Police are conducting the largest tactical operation in Australia's history, with more than 125 specialist police called in to join the search from interstate and New Zealand.

Photos released by Victoria Police on Sunday show just how difficult and expansive the search area is for officers tasked with apprehending Freeman.

Heavily armed specialist police are shown squeezing between narrow rock crevices, searching darkened caves and parachuting into remote parts of the bush in

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