That animated image is made up of a canvas background of the world and an SVG foreground of the cables. Both are created using js from downloaded json data, ne_

That animated image is made up of a canvas background of the world and an SVG foreground of the cables. Both are created using js from downloaded json data, ne_110m.json and fusion-cables-2019-02-27-simplified.json. Quite tough to get that into something that's not using pixel graphics and self-contained (aka only displaying the stuff in the page).