by Narrator » Tue Feb 03, 2015 8:09 pm
As he moves deeper into the tunnel, the grooves come into view. They look similar to what he saw on the inside of the drain pipe earlier in the day, but in a much larger scale. They form whorls, occasionally veer at angles, and form a design in the stone that's frankly a bit dizzying.
Meanwhile, the storm drain water seems to be churning in a way that honest London rainwater probably doesn't.