It's well-known in Britain, at least. It looks to be part of the science examination taken at age 16 [2].
On your Wikipedia page, the section "British dominance of early cable" [1] describes the early success in this technology.
Last time I was at the Science Museum in London, they had an exhibition on transatlantic cables. I think it's part of the permanent exhibition. [0] [3]
[0] https://www.sciencemuseum.org.uk/objects-and-stories/how-per...
[1] https://en.wikipedia.org/wiki/Submarine_communications_cable...
[2] https://www.bbc.com/teach/class-clips-video/the-invention-of... (video probably only available in the UK).
[3] https://collection.sciencemuseum.org.uk/search/gallery/infor...