Jim examined the walls. "There would not be much difficulty in working through them if we had a couple of good knives, they are made of sun-dried bricks. However, we will hunt about among this rubbish and see if we can find some more bits of iron. Anyhow, we can wait a day or two before we make up our minds about it and see what comes of it. I vote we clear up this litter a bit, and chuck it out through the opening. There is a close, musty smell in the place. The opening will be very handy for chucking everything out and keeping the place as clean as we can."