At one point the three children turned right onto a narrower corridor, which was derived from the main aisle. After a few dozen steps, they saw this aisle was much safer than the main one, because it was supported by strong roots.

"Dry poplar ..." Johnny told them, looking at those roots that were as thick as marble columns from an ancient temple, but these columns were wooden... made of woody roots.

"We've come down quite a bit, but I don't think we'll find a sprout here," ...