And so the long and the short of it was that Mr. Bhnh was suffered to bring his boat through that tunnel under the wharf. After they passed under the arch, the sky appeared again briefly, but a good half of it was occulted by that out-thrust bulwark: St. Thomas's Tower, a fortress unto itself, grafted to the outer wall of the Tower complex, straddling another stone arch-way paved with fœtid moat-water. Their progress was barred by a water-gate filling that arch. But as they approached, the gates were drawn open, each vertical bar leaving an arc of oily vortices in its wake. Mr. Bhnh hesitated, as any sane man would, and tilted his head back for a moment, in case he never got a chance to see the sky again. Then he probed for the bottom with his pole.