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FD-302 (Rev. 3-25-60) FEDERAL BUREAU OF INVESTIGA ¥ Dote __ 6f2ef62 On J ial scents > \ and located a partially com- pleted rubber raft approximately six feet by two feet with a wooden valve and casing which was located in the air vent on top of Cell block B. a 6/12/62 Alcatraz Island, California 72. sr 76-2887 ot File # by Dote dictated ‘This document containg neither recommendations nor conclusions of the FBI. ft ts the property of the FBI and te loaned to your agency; it and Its contents are not to be distributed outside your agency. -16- 6&4