In August 1925, a hydrothermal explosion happened in Biscuit Basin. This is a blast that happens when hot underground water breaks rocks. Nobody saw the explosion when it took place. It likely formed or grew a pool near Black Diamond Pool. After the blast, a sign for "Black Pearl" was put near the site. This was a mistake, and it…
Rewritten with AI from facts reported by USGS. Read the original for the full report.