Australian activists arrested while trying to break Israel's naval blockade of Gaza have complained to diplomatic officials of serious mistreatment by Israeli authorities, including physical beatings in a "dystopian" prison environment.

Fresh details have emerged of the experiences Australian members of the Global Sumud Flotilla crew detained by Israeli authorities, as another 171 of the activists were deported — among them Greta Thunberg.

The ABC has obtained redacted summaries of the reports prepared by Australian diplomatic staff in Israel who met with the Australians in custody in the high-security Ketziot prison, near the Israel-Egypt border in the Negev Desert.

Some of the Australians reported the rough treatment from Israeli authorities began after the crews were brought to Ashdo

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