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FD-302 (Rev. 1-25-80) FEDERAL BUREAU OF INVESTIGA . Dote 6/22/62 7G, a and located a partially com- pleted rapeer raft CEST six feet by two feet with a wooden valve and casing which was located in the air vent on top of Cell block B. 6/12/62~ Alcatraz Island, California $y 2. sF 76-2887 File # ie] at b Date dictated Y . 7 ; cake Pot «na is tas This document contains neither recommendations nor conclusiona of the FBI. It ia the property of tne Fi GAG is foe your cgeney; it and its contents ara not to be distributed outside your agency, ~16- ee