This is the crypt where Princess Diana 's body was secretly buried, according to a wild conspiracy theory.
The royal was laid to rest on September 6, 1997, on an island in the centre of the Oval Lake, at the Althorp Estate, where she grew up.
But not all fans are convinced that this is the truth.
A wild theory suggests that Diana 's body is actually buried in the Spencer family vault at St Mary's Church in Great Brington and the public are being misled as to her final resting place.
Fuelling their conspiracy is the still visible trail of cement, that reportedly shows where the vault was opened around the time of Diana's death.
The crypt is also subject to heavy security measures, as seen in the Daily Star images, including a 6ft gate to keep visitors out, as well as a notice warning that the area is alarmed.
Motion sensors have also been installed to catch anyone trying to get beyond the gate.
The vault is where several generations of Diana's family are buried, including her father, John Spencer, who passed away in March 1992 after a heart attack.
Rumours about alternative locations of Diana's grave started almost immediately after the funeral, with "locals" in the village reporting "suspicious activity" in the days before and after.
Workers were called in to the church to dig a hole in the floor inside the crypt to prepare space for Diana's coffin before she was laid to rest.
Originally, Diana's brother, Earl Spencer, had planned to bury his sister in the family vault.
But he is said to have changed his mind at the last minute, stating public safety concerns as his reason.
Earl Spencer anticipated that hundreds of thousands of visitors who might want to pay their respects could overwhelm the small village if Diana was laid to rest in the church.
Instead, he decided that Diana would be buried at Althorp, so her grave could be easily tended to and her sons, Prince William and Prince Harry , could visit her grave privately to pay their respects.
But Diana fans aren't convinced, suggesting that her body was later removed from Althorp in the middle of the night and taken to the family crypt.
According to documents, the vault was sealed again on September 4, two days before Diana was buried after it was decided it would no longer be needed to house her coffin.
But in the year following her death, a spokesman for the Bishop of Peterborough, whose diocese the village falls within, told reporters the vault was actually sealed "a few days after the funeral".
It caused such a swell in rumours that the extraordinary decision was later taken to release Diana's burial records to the public, which confirmed her grave is at Althorp.
Yet, 22 years after her death, some are still not convinced and the bizarre theories continue to persist.
