Подземный храм Преподобного Серафима Саровского, Underground Orthodox temple in Tula, Russia.

The Underground Temple of Saint Seraphim of Sarov occupies the basement of the Church of Sergius of Radonezh at 76 Oktyabrskaya Street in Tula's Zarechensky district, entered through the upper church. Its vaults rise about four metres; the walls and ceilings are left unpainted, and an altar stands in the space. The chapel is housed in a building listed as an architectural monument.

The underground church is a lower-level chapel of the Church of Sergius of Radonezh on Oktyabrskaya Street in Tula, housed in a building listed as an architectural monument. The sources give no construction date for the chapel itself; its side altar is dedicated to Seraphim of Sarov, a monk of the 18th and 19th centuries. The present rector is Archpriest Vyacheslav Kovalevsky.

The temple serves as an active place for Orthodox believers to gather for regular services and spiritual practice. Visitors can experience Russian Orthodox tradition through the religious life that continues here.

The temple is accessible on most days, with group visits available by advance reservation. The entrance is located near public transportation and the underground setting is easy to reach for visitors.

The temple occupies the basement of the Church of Sergius of Radonezh on Oktyabrskaya Street and is entered through that church. Its vaults rise about four metres, and the walls and ceilings are left unpainted. The chapel of Saint Seraphim of Sarov sits in a building listed as an architectural monument.