This schematic map shows a simplification of the world’s network of submarine fibre-optic cables.Confession: when I first heard the term "submarine cable" I thought that this was some sort of MIL-SPEC for the Navy. I was young.
The map uses data sourced from cablemap.info. Each node has been assigned to a country, and all nodes located in the same country have been collapsed into a single node. The resulting network has been then abstracted.