"So fear-struck was Larry that he chattered and grimaced like an ape, and shouldered and struggled to get away from the dark and into the safety of the shaft of light that shone out of the chart-house."
"There must be strange effects in this ice-cavern, when the sun is high and sends a shaft of light through its one window to illuminate the interior."
"The rope began to jerk upwards, and Jack followed the glint of metal from the carabiner as it rose up the thin shaft of light to the hole in the limestone ceiling almost twenty metres above."