A time capsule Princess Diana left in the walls of a London hospital has been unearthed and opened more than 30 years later.

In 1991, when the Princess of Wales was president of the Great Ormond Street Hospital in London, she helped bury a lead-encased wooden box filled with items that represented life in the 1990s.

While Diana oversaw the capsule, the items were actually chosen by two children, Sylvia Foulkes and David Watson, who won a contest on the popular children’s TV show Blue Peter.

They chose to include a hologram of a snowflake, a solar-powered calculator, British coins, tree seeds from Kew Gardens, a sheet of recycled paper, a European passport, a pocket television and a copy of Kylie Minogue’s 1990 album, Rhythm of Love. A photo of Diana, a recent copy of the Times and letters from Foulkes and Watson were also added.

The time capsule was meant to be opened centuries after it was stowed away; however, new construction on the children’s clinic necessitated the demolition of the wall where it was placed, so the hospital chose to open it now.

The Times reported that the box had suffered some water damage, but the items were mostly intact. Archivists are working to restore the letters from the effects of humidity.

Jason Dawson, executive director of Space and Place at GOSH, oversaw the removal and opening of the capsule, which he told The Times was “really quite moving… almost like connecting with memories of things that have been planted by a generation gone by.”

“There were some really odd things in there that you would have thought at the time were [at the] cutting edge of technology, such as the pocket calculator and pocket TV. When you look at them now, they almost look like toys,” he said. “We had no technology to even try to play the CD on.”

Princess Diana’s time capsule actually mirrored an earlier royal ceremony. In 1872, Alexandra, then also the Princess of Wales, laid the foundation stone of the older hospital building and sealed a time capsule, which contained a copy of The Times and a photo of Queen Victoria. It has never been found. GOSH plans to plant a new capsule when the new hospital renovations are complete.

“I have no doubt that if Diana was still with us, she would still be connected with us in some way,” Dawson said. “She really was a signifier of something special.”

Princess Diana served as president of the hospital from 1989 until her death in 1997. She visited frequently, sometimes bringing along her sons, Prince William and Prince Harry.

Both William and Harry have followed in their mother’s charitable footsteps, even working directly with organizations she was passionate about.

In July, the Duke of Sussex, 40, made a return visit to Angola, where his mother began raising awareness about the dangers of landmines nearly 30 years ago. After earning its independence from Portugal in 1975, the African nation was plagued by 30 years of civil war, which left much of its countryside littered with dangerous mines.

Princess Diana visited the country in 1997 and shocked many by walking through a mine-riddled area that was being cleared with help from The HALO Trust. Diana died later that year, but Harry has continued working with the trust in her honor.

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In his most recent visit, Harry was able to revisit a section of land he had walked in 2013. Once a dangerous active minefield, it is now a safe, open area where local children play.

“As a father to young children, it breaks my heart to see innocent children still living and playing next to minefields,” the Duke of Sussex said in a statement at the time. “All of us have a duty to protect children and future generations from the harms of war, both present and past.”