Last month, the Hunga Tonga-Hunga Ha’apai volcano erupted. It has already broken two records.

Volcano Tonga broke two records at the same time. The plume reached a higher height than any other eruption, and the eruption itself triggered an unprecedented number of lightning strikes, nearly 590,000 over three days, Reuters reported.

Underwater volcanic eruptions do not typically release large plumes of gas and particles into the air. However, this record-breaking eruption was the exception to the rule.

“The combination of volcanic heat and the amount of superheated moisture from the ocean made this eruption unprecedented. It turned out to be something like a hyperfuel for a mega-thunderstorm,” explains Christopher Bedka, an employee of the NASA Research Center at Langley, which specializes in the study of extreme storms. “The eruption generated an incredible amount of lightning.”

The Hunga Tonga-Hunga Ha’apai Volcano is located about 65 km north of Tonga’s capital, Nuku’alofa, and lies within the so-called Tonga-Kermadek volcanic arc. It’s a line of underwater volcanoes (mostly) that runs along the western edge of the Pacific Plate, according to the journal Nature.