Pg.14 #2457 Two-hundred ton two-way trailer, for transporting sections of 30 ft. penstock pipe. Dec. 15th, 1933. Pg.14 #2460 View of 200-ton two-way trailer, with test load. Dec. 15th, 1933. Pg.14 #2481 Excavation for Downstream Plug, Diversion Tunnel No. 3. Dec. 29th, 1933. Pg.14 #2485 Excavation for Downstream Plug, Diversion Tunnel No. 3. Dec. 29th, 1933.

A section of a penstock pipe arrives at the mouth of an adit leading to the interior of one of the diversion tunnels during the construction of Hoover Dam.