Jabarkan Pemenjaraan dari Mordechai Vanunu dalam bahasa melayu

Vanunu was put on trial in Israel on charges of treason and espionage. The trial, held in secret, took place in the District Court in Jerusalem before Chief Justice Eliahu Noam and judges Zvi Tal and Shalom Brener. He was not permitted contact with the media but he wrote the details of his capture (or "hijacking" as he put it) on the palm of his hand, and while being transported he held his hand against the van's window so that waiting journalists could get the information

On February 27 1988, the court sentenced him to 18 years' imprisonment from the date of his capture. The Israeli government refused to release the transcript of the court case until, after the threat of legal action, it agreed to let censored extracts be published in Yedioth Ahronoth, an Israeli newspaper, in late 1999.

The death penalty in Israel is restricted to special circumstances. In 2004, former Mossad director Shabtai Shavit told Reuters that the option of extrajudicial execution was considered in 1986, but rejected because "Jews don't do that to other Jews."

The Israeli government kept him in near total isolation for more than 11 years, allegedly out of concern that he might reveal more Israeli nuclear secrets and because he was still bound by the contract that swore him to secrecy on the subject. While in prison, he refused psychiatric treatment.

Many critics argue that Vanunu had no additional information that would pose a real security threat to Israel, and that the Israeli government's real motivation is a desire to avoid political embarrassment and financial complications for itself and allies such as the United States.  By not acknowledging possession of nuclear weapons, Israel avoids a US legal prohibition on funding countries which proliferate weapons of mass destruction.  Such an admission would prevent Israel from receiving, as it does now, more than $2 billion each year in military and other aid from Washington.

Ray Kidder, then a senior American nuclear scientist at Lawrence Livermore National Laboratory, has said:

His last appeal against his conviction, to the Supreme Court of Israel in 1990, failed.

While in prison, Vanunu says, he took part in small acts of rebellion, such as refusing to talk with the guards, reading only English-language newspapers, and watching only BBC television.  "He is the most stubborn, principled, and tough person I have ever met," said his lawyer, Avigdor Feldman.