Volcanic islands like Hawaii are built over long periods (typically at least 500,000 to 1 million years), so their older volcanic history is often hidden beneath younger lava or impacted by tropical weathering. Much of this history only becomes visible after major erosion late in a volcano’s life. To uncover this missing record in younger Hawaiian volcanic landforms, scientists on IODP Expedition 389 drilled into reef deposits offshore of four Hawaiian volcanoes in 2023. While the main goal was to study sea level and climate history, we also recovered volcanic rocks buried within or beneath the reefs. About 17% of the recovered material was volcanic, providing rare samples from time periods not well preserved on land. These rocks are mostly from distant sites relative to known eruption vents and likely came from large lava flows. We will discuss their textures, minerals, and chemistry to understand the types of eruptions that created them, whether on land, underwater, or at the shoreline. This will help reconstruct how and when the volcanoes erupted, and how the island has changed shape and sunk over time.