History Guy on the Survey of Everest
I didn't see your post until I posted a link to this video myself. The History Guy is pretty cool, especially in this episode.
That is a very good video. I stumbled across it myself a couple of days ago. It reminded me of this article from 2001:
The geodesy that was discovered from this survey is incredible. I have no doubt it significantly influence the geodetic surveys here in the US in the early 20th century.