Thousands of political prisoners were tortured and killed there, their bodies dumped dead or drugged into the sea from military aircraft.
In a 1985 trial of junta leaders, Mr Massera was convicted of murder, torture and robbery. But he served only five years of his life sentence before he was released under an amnesty law.
In 1998 he was put under house arrest on charges of stealing babies born to political prisoners and giving them up for adoption, a crime not covered by the amnesty law.
And in 2007 his life sentence was reinstated after the courts ruled that the amnesty law was unconstitutional.
But after suffering a stroke in 2002, he was considered too ill to face further prosecution, sparing him the multiple trials being faced the former President Jorge Videla and other junta figures.
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