Matrosskaya Tishina (Russian: Матросская тишина, literally "Seaman's Silence") (formal name: Federal Budget Institution IZ-77/1 of the Office of the Federal Penitentiary Service of Russia in the City of Moscow) is a detention facility located in eastern Moscow, known by the name of the street on which it is located. It has operated as a prison since 1945, famously holding Mikhail Khodorkovsky and some plotters of the 1991 Soviet coup d'état attempt.