This was a much more serious task than he anticipated.

The wall was of considerable thickness, and built altogether of stone; and the noise he was compelled to make in using the heavy bar, which brought sparks with every splinter he struck off, was so great, that he feared it must be heard by the prisoners on the Debtors' side.

Heedless, however, of the consequences, he pursued his task.
Half an hour's labour, during which he was obliged more than once to pause to regain breath, sufficed to make a hole wide enough to allow a passage for his arm up to the elbow.

In this way he was able to force back a ponderous bolt from its socket; and to his unspeakable joy, found that the door instantly yielded.
Once more cheered by daylight, he hastened forward, and entered the chapel..