An interesting interactive map of undersea cables. Looks like several come into Singapore but into only two termination points.
http://www.submarinecablemap.com/
And another interesting cable map.
http://submarine-cable-map-2014.telegeography.com/
And an internet exchange map... looks like Singapore has six.
http://www.internetexchangemap.com/
Fascinating real time traffic and attack maps.
http://www.akamai.com/html/technology/dataviz1.html