118 - Pile driver placing steel caissons 8 feet in diameter for constructing grade piers upon which the tube segments will rest down to final line and grade. No. 118. Camera, 8x10"; Lens, 12"; Scene, looking north up tube cut toward the estuary, pile-driver pulling caisson from bottom of cut, and electric crane working at the right; Location of camera, on wooden causeway connecting Alameda Portal Bldg. with main-land, camera pointed just west of north; Print, 8x10.