A tour boat traveling off the coast of Hawaii was reportedly hit with a “basketball-sized” lava bomb — leaving 23 people injured after an explosion sent rocks flying through the air.

The Hot Shot boat was near the big island of Kapoho on Monday morning when the punctured the hole of the roof at around 6 a.m. local time, according to Hawaii News Now.

Video of the incident shows a massive fireball rocking the vessel.

The lava bomb stems from ongoing eruptions from Kilauea that began May 3 and has since destroyed more than 700 homes, the website said.

The boat returned to the harbor at about 7 a.m. and passengers were taken to a local hospital.

One woman in her 20s was in serious condition with a fractured femur.

Other passengers suffered burns and scrapes, according to the state Department of Land and Natural Resources.