Two men have claimed they were stalked in a tunnel by a three metre beast they believed to be a yowie in regional New South Wales.

Australian Yowie Hunters has shared incredible audio the men recorded of the creature in Newnes, in the NSW Central Tablelands, in the early hours of March 23.

Captured in the popular Glow Worm Tunnel in Wollemi National Park near Lithgow, the mythical beast which is Australia's version of Bigfoot can't be seen in the footage but makes presence known with its loud eerie howl.

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