Envelope reads "Same as 3152" [3152 read "Hetch Hetchy Mitchell tunnel cave-in 1-11-31."]. Photograph shows two men dressed in what appear to be fireman's coats and hats. They stand next to eachother holding something in front of them which they appear to be reading or studying. The man on the ritght has a moustache. This photograph was printed in the Oakland Tribune on Jan. 11, 1931 with the caption "Supervisor Jesse C. Colman, chairman of the San Francisco board of supervisors public utilities committee (at left) and City Engineer M.M. O'Shaughnessy, as they appeared on a visit to the scene of the cave-in to inspect the tunnel and rescue workers." For more information about the Mitchell Tunnel cave-in see h99.1.498. For more information about M.M. O'Shaughnessy see h99.1.486.