[ender7]

While manufacturing the cable is expensive, actually laying it (in that particular part of the ocean) is not that challenging. They essentially just drive a ship along that path while slowly spooling out the cable from the rear. They have the advantage that that stretch of ocean doesn't contain much of anything to plan around.

[pchristensen]

Anyone interested in the process (or just loves captivating writing about technical subjects), read http://archive.wired.com/wired/archive/4.12/ffglass.html. Can't recommend it enough.