Read it through once

From the cistern we descended twelve steps into a large roughly-shaped grotto, carved wholly out of the living rock. Helena blasted it out when she was searching for the true Cross. She had a laborious piece of work, here, but it was richly rewarded. Out of this place she got the crown of thorns, the nails of the cross, the true Cross itself, and the cross of the penitent thief. When she thought she had found every thing and was about to stop, she was told in a dream to continue a day longer. It was very fortunate. She did so, and found the cross of the other thief.