During a 1986 repair to the floor of the Calvary Chapel by the art historian George Lavas and architect Theo Mitropoulos, a round slot of 11 cms diameter was discovered in the rock, partly open on one side (Lavas attributes the open side to accidental damage during his repairs); George Lavas, The Rock of Calvary, published (1996) in The Real and Ideal Jerusalem in Jewish, Christian and Islamic Art (proceedings of the 5th International Seminar in Jewish Art), pp.