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Runit Dome
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The Runit Dome, often referred to as "The Tomb," is a massive concrete structure on Engebi Island, part of the Enewetak Atoll, serving as a grim reminder of the Cold War's nuclear legacy. It was constructed in the late 1970s to encapsulate radioactive debris and contaminated soil collected from across the atoll following 43 nuclear tests conducted by the United States. The 45-centimeter-thick concrete shell covers the Cactus crater, which was created by an 18-kiloton explosion in 1958. Inside lies approximately 73,000 cubic meters of radioactive waste, including plutonium-239. Today, the dome is a subject of significant environmental concern, as it lacks a lined bottom, leading to fears that rising sea levels, ocean surges, and structural cracks could cause radioactive materials to leak into the surrounding marine ecosystem and the broader Pacific Ocean.
- Location: Marshall Islands
- Nearby: Enewetak (22 km)
Best time to visit & climate
The most pleasant time to visit is Jan–Mar.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg °C | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
| Rain mm | 34 | 32 | 36 | 62 | 75 | 75 | 126 | 162 | 161 | 200 | 121 | 54 |
📋 Practical info
Visiting
The dome is sealed and off-limits due to radioactive contamination. Visitors can only view it from a safe distance via boat or nearby island.
Typical hours
The site is not open to the public, so there are no set hours. Typically, daylight hours are best for distant viewing.
Photography
Photography from a safe distance is allowed. Avoid capturing sensitive security areas if any.
Time needed
A brief stop of 10-15 minutes for viewing from a distance. Most tours pass the dome as part of a larger island tour.
Combine with
Combine with a visit to nearby Enewetak Atoll or other nuclear test sites. Local boat tours often include the dome in their itinerary.
Getting there
Access is by private boat or organized tour from Majuro. No regular public ferries serve the atoll.
Insider tip
Bring binoculars for a closer look from a safe distance. Check current health advisories regarding radiation before traveling.
Geography
Facts
- Consists of 358 concrete panels, each 18 inches thick
- Contains approximately 73,000 cubic meters of radioactive waste
- Built over a crater created by the Cactus nuclear test
- Construction period lasted from 1977 to 1980
- The cleanup project cost approximately $218 million
- There is no protective lining at the bottom of the crater
Route planner — Car & Motorhome
Where do you start? We build the route here, with stops and country notes along the way.
Vehicle
Only stops with (optional):
© OpenStreetMap contributors · OpenRouteService
Sights in the town Runit Dome (1)
Sights nearby
Frequently asked questions
Is the Runit Dome a tourist attraction?
No, it is a historically tainted area with radiation risks.
Can you visit the site?
Access is strictly prohibited for safety reasons.
What is under the dome?
It contains radioactive waste from the nuclear tests.
Is the dome stable?
There are concerns about the concrete's integrity due to sea-level rise.
Why was it built?
It was built in the late 70s to seal in radioactive debris.
Runit Dome: where is it located?
Runit Dome is located in Marshall Islands.
Runit Dome: when is the best time to visit?
The most pleasant time to visit is Jan, Mar.
Runit Dome: why is it worth visiting?
The Runit Dome, often referred to as "The Tomb," is a massive concrete structure on Engebi Island, part of the Enewetak Atoll, serving as a grim reminder of the Cold War's nuclear legacy.
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