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A drilling platform at a tunnel portal

Name: A drilling platform at a tunnel portal
Uploaded: 2026-08-31T02:57:24.534Z
Duration: 51 s
Description: A tall scaffold of timber and steel, several levels high, is built on the chassis of a truck and stands before the dark mouth of a tunnel cut into the rock; workers in hats stand on its platforms and a row of men waits in front with hoses and tools. For the four diversion tunnels, two on each side of the canyon, drills were mounted on such truck platforms and driven against the rock face.

A tall scaffold of timber and steel, several levels high, is built on the chassis of a truck and stands before the dark mouth of a tunnel cut into the rock; workers in hats stand on its platforms and a row of men waits in front with hoses and tools. For the four diversion tunnels, two on each side of the canyon, drills were mounted on such truck platforms and driven against the rock face.

Period: c. 1931–1932
Credit: US National ArchivesPublic Domain (NARA) · Digitalisierung und Bearbeitung: © zb Media GmbH

Specifications

Clip name: HFE004076
Length: 0' 51"
Aspect Ratio: 16:9
Frames per Second: 24 fps
Chroma Subsampling: yuv422p10le
Resolution: 1920 × 1080
Format: MOV
File Size: 1,125,288,996 bytes

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