There is more than one though they work at different latencies. If the fastest one goes down then all the data will go the next best route. Generation 2 starlink satellites are meant to be faster than cable as the satellites will talk to each other in the vacuum of space by laser. This may be another Musk promise that takes longer than anticipated to be realised though.

Hi,
just of curiosity,
would we be able to continue Forex trading if the undersea internet cable blows up???
There is more than one though they work at different latencies. If the fastest one goes down then all the data will go the next best route. Generation 2 starlink satellites are meant to be faster than cable as the satellites will talk to each other in the vacuum of space by laser. This may be another Musk promise that takes longer than anticipated to be realised though.
Here is another look as well (I count 18 North Atlantic crossings alone):-
https://www.submarinecablemap.com/
https://www.infrapedia.com/Cool resource. Do you have a reference for internet trunklines? Not finding it on that site. I've seen some Verizon maps but they are not available to the public.