João Tomé, writing on the Cloudflare blog:

The latest Internet outage, in the South Pacific country of Tonga (with 169 islands), is still ongoing. It started with the large eruption of Hunga Tonga–Hunga Haʻapai, an uninhabited volcanic island of the Tongan archipelago on Friday, January 14, 2022. The next day, Cloudflare Radar shows that the Internet outage started at around 03:00 UTC (16:00 local time) — Saturday, January 15, 2022 — and is ongoing for more than four days. Tonga’s 105,000 residents are almost entirely unreachable, according to the BBC.

James Vincent, writing for The Verge:

Like many island nations, Tonga relies on just a single undersea cable, about the thickness of a garden hose and filled with fragile fiber-optic filaments, to get citizens online. But on Tuesday, the government of Tonga said “communications both international and domestic were severed due to damage sustained by the submarine cable.”

According to the BBC, repairs coule take upto two weeks.

“It could take up to two weeks to get it repaired. The nearest cable-laying vessel is in Port Moresby,” he added, referring to the Papua New Guinea capital, more than 4,000 km (2,500 miles) from Tonga.