A New Zealand-led team has just finished mapping the flanks of the seamount, which many people thought might have been torn apart in the ferocity of the event.
But structurally, Hunga-Tonga Hunga-Ha'apai hasn't changed that much.
The Tonga eruption produced the biggest atmospheric explosion recorded on Earth in more than a century.
It generated tsunamis across the Pacific and in other ocean basins around the world. It even lifted the clouds over the UK, 16,500km away. Mercifully, only a handful of people lost their lives in the kingdom of Tonga.
