The now-mosque also faces neglect in the form of trash lying around and layers of dust.
Experts commented and fear for the future of the building without proper maintenance and protection.
Hagia Sophia used to be one of the main Christian cathedrals.
In 2018 the same church had been desecrated by racially offensive graffiti.
Three men were detained in their homes after videos circulated of them dancing on a large gate to an Armenian Church in Istanbul.
Hagia Sophia used to operate as a museum and any changes to that status is understood to negatively impact its UNESCO standing.
The area of today's Turkey used to be inhabited mailnly by Christian populations such as Greeks, Assyrians, and Armenians.
The Chora Church, located in Istanbul, is considered second in renown compared to the Hagia Sophia.
A cathedral once the centre of Eastern Orthodox Christianity has seen its identity changed yet again..