Search for all of "Tunnels", all of "Construction Workers", all of "Construction Equipment"

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1. Construction near the upper portals of diversion tunnels no. 1 and no. 2
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2. Dump trucks on temporary dike in front of portals of diversion tunnels no. 3 and...
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3. View of the concrete lining in the diversion tunnels
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4. Side-wall jumbo inside diversion tunnel
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5. Closeup of Upper Portal of Diversion Tunnels No. 3 and 4, during preparations for blast.
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6. Hoover Dam construcion -- blasting
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7. Workers in diversion tunnels -- Hoover Dam site
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8. Close-up of trimming jumbo
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9. Lewis Construction Company drilling railroad tunnels of U.S. Construction Railroad to Hoover Dam.
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10. Six Companies' power shovel dumping dirt in dump truck in diversion tunnel at Hoover Dam...
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11. Crane transporting mixers in diversion tunnel at Hoover Dam site
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12. Trash rack structure being installed in front of diversion tunnel no. 2
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13. Workers and drilling jumbo inside diversion tunnel no. 4
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14. Close-up of workers using a drilling jumbo inside a diversion tunnel
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15. Construction worker in bulldozer in front of diversion tunnel portal
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16. Construction workers using a drilling jumbo inside a diversion tunnel
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17. Invert concrete pouring forms inside diversion tunnel
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18. Gantry crane inside diversion tunnel no. 3
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19. Concrete lining inside diversion tunnel no. 2
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20. Construction of steel forms for the lining of the diversion tunnels
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21. Excavation for downstream plug, Diversion Tunnel No. 2.
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22. Excavation for downstream plug, Diversion Tunnel No. 3.
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23. Construction on the no. 4 penstock raise
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24. Construction in the no. 4 penstock raise
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25. Construction in the no. 1 penstock raise
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26. Switchyard control circuit tunnel under construction -- Hoover Dam site
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27. Construction at Hoover Dam, inside a tunnel
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28. View inside a tunnel at Hoover Dam site
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29. Interior of Hoover Dam diversion tunnel during construction
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30. Crew working at Hoover Dam site
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31. Digging diversion tunnels at Hoover Dam.
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32. Agitators dumping concrete into buckets
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33. Blasting at Hoover Dam site
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34. Inside a diversion tunnel -- Hoover Dam construction
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35. Construction of Hoover Dam diversion tunnel
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36. Construction workers inside Hoover Dam diversion tunnel
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37. View showing method of finishing slabs in invert lining.
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38. Trucks hauling concrete in the diversion tunnel
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39. Section of a concrete-pouring jumbo standing outside of a diversion tunnel
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40. Interior of penstock tunnel -- Hoover Dam construction site
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41. Close-up of formwork in the Arizona power house
 

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