Well aware that the doors in this passage were much stronger than those in the entry he had just quitted he was neither surprised nor dismayed to find it fastened by a lock of unusual size.
After repeatedly trying to remove the plate, which was so firmly screwed down that it resisted all his efforts, and vainly attempting to pick it with the spike and nail; he, at length, after half an hour's ineffectual labour, wrenched off the box by means of the iron bar, and the door, as he laughingly expressed it, "became his humble servant." But this difficulty was only overcome to be succeeded by one still greater.

Hastening along the passage he came to the sixth door.

For this he was prepared; but he was not prepared for the almost insurmountable obstacles which it presented.

Running his hand hastily over it, he was startled to find it one complicated mass of bolts and bars.

It seemed as if all the precautions previously taken were here accumulated.