On our last pilgrimage to the Holy Land, we had Mass inside the Edicule, which is a small shrine or chapel inside the Church of the Holy Sepulchre.
On the Holy Saturday Orthodox celebration, the holy fire is brought out from the tomb of christ to light the Paschal Candle and all the candles and torches inside the Church. Here's a picture of the Holy Fire. http://photoblog.nbcnews.com/_news/2011/04/23/6518185-christian-orthodox-holy-fire-ceremony-lights-up-the-church-of-the-holy-sepulchre-in-jerusalem?lite

You can see more information about the restoration of the Edicule here: https://news.nationalgeographic.com