トンガとの海底ケーブルは恐らく無事で、現在連絡が取れて復旧に取り組んでいるらしい

Relief as Southern Cross Cable confirms contact with Tongan comms centre | Stuff.co.nz
https://www.stuff.co.nz/business/127512800/relief-as-southern-cross-cable-confirms-contact-with-tongan-comms-centre