In the video one can see that in the supposed grave of Jesus the Nazarene, one silver candle is put and after the ceremony they relight all the candles and lamps again from that candle. This lamp has openings called tongues, so that the fire keeps burning while it is in the grave. All explained in Greek by an Archdeacon in 1965. They don't even call it a mystery. He tells a story about a dean insisting that the ceremony should be announced as a mystery, althought it is clear to everyone what happens and a dean isn't even a prelate.
