Work on the grave has already begun inside the cathedral. The burial site has been selected on the left side of the church, near the altar.
For reference, the Catholicos-Patriarch of All Georgia, His Holiness and Beatitude Ilia II, passed away at the age of 93 on March 17. A period of national mourning has been declared in Georgia, and he will be laid to rest at Sioni Cathedral on March 22.