A new documentary series explores an infamous set of disappearances around one of New Zealand's most dangerous beaches.

As well as the six missing people who vanished in Piha, Black Coast Vanishings reveals others have had 'near misses'- fuelling speculation there's a serial killer in the area.

Co-director Candida Beveridge says the series was designed to give a voice to concerns about the safety of the community.

"What surprised us is what came out during the investigation- women being stalked, women being terrified in the bush. That, we felt, needs investigation."

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