This is an interesting Video. Showing how they Strung Half Million Volt DC Transmission Wire, in New Zealand, in 1965. They had some real Acrobats, building those Towers and running the Wiring. I had a job, installing DC Double Ought Battery Warring, among other types. In Telephone Company, Central Offices, back in 2000. And I can tell you. That big wire, is heavy! We were just running it, in Racks, about 16 to 20 feet above the ground. In Air Conditioned Buildings. I can't imagine. Doing that on those Towers, outdoors. In the Wind and Weather! Check out the related videos too...

Don

THE FIRST HALF-MILLION VOLT D.C. TRANSMISSION LINE (1965) (AAPG W3606/1161)

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Video link...
https://www.youtube.com/watch?v=a9zdz780l-U

Uploaded on Nov 23, 2011

How electricity is fed to the Cook Strait submarine cable. Surveying for the line; building the bridges, roads, and camps needed; erecting a tower above Benmore dam; taking tow-ropes across country by hand and by tractor; and stringing and jointing conductors. 2K scan from 16mm print.