Tonga’s volcano blast cut it off from the world. Here’s what it will take to get it reconnected.

Hunga Tonga–Hunga Ha‘apai, an underwater volcano off the coast of Tonga, has erupted several times in the last 13 years, but the most recent, on January 15, was likely its most destructive. The blast has had global consequences: more than 6,000 miles away, waves caused by the eruption drowned two people in Peru. But the effect…