[FarCenter]

Since about 2010, there is some capacity via China Telecom, China Unicom and Rostelecom, but I think it is still small compared with the Atlantic and Pacific cables.

Terrestrial routes south of the Himalayas involve too many countries to transit. Putting the cable offshore is a good technical solution to an intractable political problem.

[Yo-Yo]

Here's an interactive version of the undersea cable map. Zoom in and enjoy.

https://www.submarinecablemap.com/

[Yo-Yo]

Since about 2010, there is some capacity via China Telecom, China Unicom and Rostelecom, but I think it is still small compared with the Atlantic and Pacific cables.

Not sure how accurate it is, but here is a map of terrestrial communications cables from the ITU:

(Interactive version here:https://bbmaps.itu.int/bbmaps/)