[parliament32]

I figure the hard engineering challenge is the repeaters. How do you build repeaters and power them, considering you can't really service or replace them ever over the lifespan of the cable (the deep ocean bits anyway)? A repeater every 80km is a whole lotta repeaters.

[ativzzz]

They are repairable: http://www.k-kcs.co.jp/english/solutionRepairingMethod.html