to penetrate Israel's political, military and intelligence circles and gather information on Israel's alleged nuclear and non-conventional capabilities, while Israel has also penetrated the US government, and has engaged in industrial espionage in the United States in an attempt to boost its military and alleged nuclear capabilities. In a most notable and publicized espionage case, Jonathan Pollard, a civilian analyst working for US naval intelligence, was arrested in 1985 and charged with conveying highly classified documents to Israeli agents. He pleaded guilty to one count of conspiracy to deliver national defense information to a foreign government, and was sentenced to life imprisonment. Israel later granted him citizenship, and has periodically requested his release. In 1996, two espionage scandals broke. It was revealed that the National Security Agency wiretapped the phone lines to Israel's embassy in Washington and broke the Israeli security code, exposing Israel's deepest policy secrets to the United States. The wiretapping was discovered following the widely publicized "Mega Scandal", when a phone call intercepted by the NSA became public. Due to Israel's expertise in computers and electronics and the sophistication of its electronic code system, it was widely believed that the NSA used an Israeli mole to obtain the security code. The resulting "Mega Scandal" was the allegation that Israeli intelligence had a highly placed mole within the US government. On 10 November 2004, a US submarine entered Israeli territorial waters eighteen kilometers off the coast of Haifa. The submarine's mission was never revealed. It was thought to have been trying to gather intelligence on the city's naval base and headquarters and other vital infrastructure, and was also suspected of intending to intercept Israeli naval electronic signals and test Israel's response to an intrusion. It also may have been trying to install sensors near Israeli naval headquarters and other vital installations. Minutes after it entered Israeli waters, the submarine was detected and tracked by the Israeli Navy. The submarine was initially identified as belonging to a NATO power, and later confirmed to be American. The Israeli General Staff refrained from ordering an attack on what was considered the asset of a friendly nation. After several hours, the submarine submerged and fled, presumably determining that it was under surveillance. The Israeli Navy then sent fast patrol craft, missile boats, and helicopters in pursuit. The submarine was not found, but military sources maintained that the submarine had failed to complete