Full Breakdown
Holei Sea Arch Collapses After Centuries of Erosion
By Drooid · · How we work
Core Event: Arch Falls Into the Pacific
The 90-foot Holei Sea Arch, a basalt formation cut from an ancient lava flow in Hawai‘i Volcanoes National Park, collapsed into the ocean sometime between September 23 and September 27, 2026. The exact moment is unknown; park officials say the failure could have occurred while the park was temporarily closed during Tropical Storm Nolo. The arch’s disappearance was confirmed in a news release on October 1, 2026, and the site is now marked as “permanently closed” on Google Maps.
Background & Context
Formed roughly 550 years ago, the arch was created by differential erosion—waves preferentially wearing away softer basalt while harder rock remained. The U.S. Geological Survey describes this process as a gradual “crushing” of the pillar by daily surf. The surrounding cliffs have been destabilized repeatedly: earthquakes during the 2018 Kilauea eruption and a summit collapse damaged the shoreline, and in January 2020 new cracks forced the park to relocate the original viewing platform. A safer overlook opened in March 2020. Later that year, massive surf from Tropical Storm Darby broke off a chunk of rock from the lower arch.
Data & Statistics
- Height of arch: 90 feet (? 27 meters).
- Age of formation: about 550 years.
- Timeline of recent instability: 2018 Kilauea eruption -> January 2020 viewing-area closure -> March 2020 new platform -> 2020 Darby-induced rock loss -> September 23 2026 still standing -> September 27 2026 collapsed.
- Google Maps now labels the location “permanently closed.”
Official Statements & Responses
The agency warned visitors to stay back from the unstable cliff edges, describing the drop-offs as “vertically into the ocean” and a “serious falling hazard.” The National Park Service (NPS) also highlighted the risk to first responders who might be called to rescue anyone who ventures onto the closed area.
On-the-Ground Reports
Visitors who arrived after the park reopened on September 28 reported an empty gap where the arch once stood. Some travelers, unaware of the closure, approached the shoreline and were reminded by park signage of the danger. One visitor, Fahad Shaon, described the surrounding cliffs as “really awesome” and said the drive remained worthwhile even without the arch.
Why It Matters
The loss of Holei Sea Arch illustrates the dynamic nature of coastal geology on volcanic islands. While the formation was a major tourist draw, its collapse underscores the importance of adaptive management of natural landmarks that are inherently transient. The incident also prompted renewed safety messaging from the NPS, reinforcing protocols that restrict public access to unstable coastal zones to protect both visitors and emergency personnel.
Verbatim Quotes
- “Photos on social media show people entering the closed area near where the sea arch once stood, putting themselves and first responders at great risk of falling and drowning off the rough, wave-swept coast,” — Sunday, HVNP
- “Yes, it’s true. RIP Holei Sea Arch,” — Volcanoes National Park
- “The cliffs are really awesome. Even if without the sea arch, I think it's worth the drive, and it's worth spending some moments (here),” — Fahad Shaon
- “Visitors are required to stay out of closed areas and away from cliff edges which are unstable and can collapse without warning,” — Hawai‘i Volcanoes National Park