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Exclusive: Secret footage released of infamous Aussie detention centre holding 60 Kiwis

ONE News can reveal contraband footage of a squad of armoured Serco officers moving into the prison units on Christmas Island, where 60 New Zealanders await deportation from Australia.

The exclusive footage is understood to have been filmed by a detainee, and appears to show a heavily armoured squad entering the Serco-run centre.

A Kiwi detainee says conditions are unbearable and inmates are locked down 21 hours a day. Source: 1 NEWS

A Kiwi imprisoned on the island says conditions are "unbearable" and inmates are in lock down for up to 21 hours a day.

"There is a yard in our compound, but there is nothing like, no exercise. You can't run around or play sport or whatever."

A Kiwi detainee says conditions are unbearable and inmates are locked down 21 hours a day. Source: 1 NEWS

The detainee, who doesn't wish to be named, said he's being denied treatment for a back injury, and can't see a psychologist.

"In detention right, there's a fine line that they are flirting with, our mental health, you know, because a lot of boys in here have suffered some form of abuse when they were young, whether it be physical or sexual."

He also told ONE News that the New Zealand High Commission in Australia isn't returning his calls for help.

"They are just sitting up in Canberra, in their air condition office, sipping on tea, coffee."

He said 60 New Zealanders have been detained on the island, while 30 more are expected on Saturday.

Opposition politicians are demanding the New Zealand Government do more to help those stuck on the island.

Labour's Kelvin Davis is in Sydney to check what he's been told about the plight of those locked away.

"The things that have happened to them have been, quite frankly, appalling. There's been beating, there's been people moved, woken up, cuffed in the middle of the night."

Prime Minister John Key has promised to raise the issue with Australian Prime Minister Malcolm Turnbull this weekend.