Political parties and human rights groups have blasted "secrecy" over the Albanese government's deal to send hundreds of former detainees to Nauru following the first deportation to the Pacific island.

Little is known about the arrival of the first member of the so-called NZYQ cohort , revealed in Nauru's parliament by President David Adeang last Friday.

It is not clear how many members of the about 350 non-citizens released into the community following a High Court ruling that their indefinite detention was unlawful are set to arrive in Nauru in the coming months, or whether a $408 million payment scheduled to be paid to Nauru once the first deportee arrived has been made.

First member of NZYQ cohort deported to Nauru

Australia could end up paying the tiny island nation about $2.5 b

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