Tula,
The event actually reads more like this: 51 And, behold, the veil of the temple was rent in twain from the top to the bottom; and the earth did quake, and the rocks rent;
So it was an earthquake that broke rocks. Well what do you think would happen?
52 And the graves were opened; and many bodies of the saints which slept arose, 53 And came out of the graves after his resurrection, and went into the holy city, and appeared unto many.
The bodies of the saints came out of their resting places in the tombs cut into these rocks. They were resurrected physically and mechanically because of this earthquake but still dead of course. Jewish custom required that they be prepared for re-burial so they went into the holy city and appeared unto many. Who carried them and how is not stated. But it was just hours before a great Sabbath so this had to be done quickly.
54 Now when the centurion, and they that were with him, watching Jesus, saw the earthquake, and those things that were done, they feared greatly, saying, Truly this was the Son of God.
That awful spiritualist called Greber brought this out in his translation and of course no one will touch it with a ten foot pole. But we know enough about the resurrection to know it did not happen then. For example: 2Ti 2:18 Who concerning the truth have erred, saying that the resurrection is past already; and overthrow the faith of some. Knowing this we should think of more realistic reasons for the event like the ones already stated about an earthquake.
Joseph