I was going to say that someone should send a missile down the Jamkran well where the 12th Imam is thought by some Shia to be alive and hidden waiting for the proper time to return, but I wandered around the Wikipedia articles on Qom and the 12 Imam and thought better of it. (Leave it to Christ to resolve.)
Brave search gives this regarding the 12th Imam
"Muhammad al-Mahdi, the 12th Imam, is a central figure in Twelver Shia Islam, believed to be the final Imam in a line of twelve successors to the Prophet Muhammad. He is also known as al-Mahdi ("the rightly guided"), Sahib al-Zaman ("Lord of the Age"), and al-Muntazar ("the Awaited One").
Birth and Lineage: Born in 869 CE (255 AH) in Samarra, Abbasid Empire, he is the son of the 11th Imam, Hasan al-Askari, and his mother, Nargis Khatoon.
Occultation: After leading his father’s funeral prayers at age five in 874 CE (260 AH), he disappeared from public view, marking the beginning of the Minor Occultation (874–941). This transitioned into the Major Occultation, which continues to the present day. Twelvers believe he is alive and hidden by divine will, not dead.
Current Status: Shia Muslims believe he is hidden in a secret location, often associated with the Jamkaran well in Iran, a site of pilgrimage where believers drop written requests for help. He is believed to be aware of all events and will reappear when the world is filled with oppression and tyranny.
Return and Role: According to Islamic tradition, he will reappear to establish global justice and equity, filling the earth with fairness after it has been filled with injustice. This event is tied to signs such as a green banner emerging from Khorasan and widespread global trials.
Sunni View: Unlike Twelver Shia Islam, Sunni Islam does not recognize the 12 Imams or the concept of a hidden Mahdi. They believe the leadership of the Muslim community (caliphate) ended with the last rightful caliph, and they do not anticipate a 12th Imam."
More info on the City of Qum.