GEVUROT MEYRUACH HAKODESH 16

25 And about chatzot halailah Rav Sha’ul and Sila were davening and were singing niggunim to Hashem, and the prisoners were listening to them. 26 And, suddenly, there came a gevaltike earthquake, so that the beis hasohar was shaken to its foundations, and immediately were opened all delatot (doors) and all sharsherot (chains) were unfastened.