Diokno spent 718 days, or nearly two years in detention, mainly at the maximum security compound of Fort Bonifacio. While Aquino was charged with subversion, no charge was ever filed against Diokno. Diokno was released arbitrarily on September 11, 1974—Marcos's 57th birthday. After his release, Sen. Diokno served as an instructor and taught some law courses at the University of the Philippines (UP) at the request of the university and its students after he was released from Fort Bonifacio. This continued until Marcos found out and had him banned, though Diokno continued returning for speeches and conferences, and was later honored with a mural of him and other martial law heroes at the school's main college of Palma Hall.