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A massive stainless steel time capsule assembled for the nation’s 250th birthday has been sealed and prepared for burial in Philadelphia, where it is expected to remain untouched until Americans celebrate the country’s 500th anniversary in 2276.
By yourNEWS Media Newsroom
After years of planning and coordination, the official America250 time capsule has been sealed, marking a major milestone in preparations for the United States’ semiquincentennial celebration. The 900-pound capsule, filled with contributions from across the nation, is scheduled to be buried in Philadelphia on July 4, 2026, and remain underground for 250 years before being opened in 2276.
The project stems from the 2016 legislation that established the nonpartisan America250 commission. Included in that law was a requirement to create a time capsule for burial in Philadelphia on the nation’s 250th birthday and to preserve it until the 500th anniversary of American independence.
The completed capsule contains submissions from all 50 states, five U.S. territories, the District of Columbia, the three branches of the federal government and various America250 programs and events, according to the Associated Press.
For Michael Berilla, who led the design and construction effort, the moment the capsule was finally sealed carried unexpected emotion.
“Once it was closed, it was a little bit anti-climactic, and then it was kind of really emotional,” said Berilla, director of the fabrication technology office at the National Institute of Standards and Technology.
Berilla’s team, part of the Department of Commerce, has extensive experience creating protective enclosures for historic records. Designing a container intended to survive centuries underground, however, presented a different challenge. The primary concern was preventing water intrusion over the next two and a half centuries.
To address that threat, engineers built the capsule from stainless steel and chose a cylindrical shape rather than a box-like design. Cylinders are less vulnerable to structural weaknesses that can develop at corners and edges. An outer cylinder will surround the main capsule, creating an additional barrier by trapping air and helping keep water away.
The capsule’s seal also relies on a compressible soft-metal rim.
“When you smash it shut with the lid, that metal goes into all the cracks and spaces and makes an airtight, watertight seal,” Berilla said.
Before the capsule was closed, its contents were maintained at 35% relative humidity. According to Berilla, that level strikes a balance between preserving delicate materials and preventing excess moisture from causing deterioration.
The capsule will ultimately rest 10 feet below the surface, a depth intended to shield it from severe weather and temperature fluctuations.
“Philadelphia would have to be six feet underwater in order for this time capsule to even possibly take on water,” he said. “And if Philly is six feet underwater, you’ve got way bigger problems in the world.”
Inside the capsule are thousands of pieces representing different aspects of American life and history. Many submissions arrived in archival-quality paper formats, including letters, poems, posters, postcards and other printed materials. Most items were stored in individual archival boxes, while paper records were placed in a dedicated compartment.
States approached the assignment in dramatically different ways.
Some focused on history. New Hampshire submitted a brochure outlining major Revolutionary War events connected to the state.
Others looked toward the future. California included a prediction generated by an artificial intelligence chatbot that was asked to imagine the state 250 years after July 4, 2026. The AI envisioned a future California without highways, with restored grizzly bear populations and a political realignment in which California joins Oregon, Washington and British Columbia in a “Pacific Federation.”
Several states assembled extensive collections. Utah contributed 100 cards highlighting notable historical residents, along with 13 coins, eight documents, eight pins, two granite disks and a booklet.
Arizona used advanced nano-etching technology to place the complete text of both the Declaration of Independence and the U.S. Constitution onto a stainless steel coin.
Other submissions stood out for their uniqueness. Maine included a bone from the endangered North Atlantic right whale, while Arkansas contributed a diamond.
Tom Medema, a retired National Park Service official who managed the project, said the absence of strict guidelines allowed states and territories to tell their own stories.
“I’m glad there wasn’t really a prescription for it,” Medema said. “I know that was hard for them, but in the end, it was just up to them to represent themselves.”
Not every proposed item made the final cut. Organizers rejected materials that could degrade over time or introduce preservation risks. Maryland’s proposed contribution of Old Bay seasoning was excluded, and Native American beadwork originally mounted on elk hide had to be resubmitted using a fabric backing.
Despite some submissions reflecting difficult chapters of American history or contemporary concerns, Medema said the overall tone of the collection remained optimistic.
“There’s great hope in what this capsule represents and the messages that are put in it,” he said. “Something about this capsule has been truly uplifting for everyone who’s been involved in it.”
The America250 capsule joins a longer tradition of commemorative preservation projects tied to major national anniversaries. A “Century Safe” assembled in 1876 was opened by President Gerald Ford in 1976. Another official bicentennial time capsule created that same year remains stored at the National Archives and is scheduled to be opened in 2076. Plans are also underway for an additional time capsule at the U.S. Capitol Visitor Center.
To maximize the chances that future generations locate the capsule in 2276, the National Park Service has incorporated information about its existence into long-term succession records. A capstone marker will also identify the burial location.
Reflecting on the project, Berilla said it prompted him to consider both the nation’s origins and its future.
Looking back over the previous 250 years, he said resilience stands out as a defining characteristic of the American story.
“And when I think forward to the future, I hope that’s what they see from us,” he said. “That, yes, we had it hard compared to them, but more importantly, we were diverse. We were interesting. We were creative. We worked together.”
Among the final items placed inside the capsule are a photograph of Berilla’s team and a letter written for the Americans who may one day open it.
“Greetings from the living, breathing hearts and hands of 2026,” Berilla wrote. “We will have long since returned to dust, but our devotion, pride, and unwavering hope for what our world could become are alive right here inside this steel. We built this for you.”
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