The tunnel all around Emile was very well illuminated by indirect lighting. Sitting on the surface of the seabed, the tunnel was forged of steelloy rings thicker than an ork, with titanium-reinforced ceramic sheets in quadruple layers. Only the visible interior was of standard macroplas, gaily painted in murals depicting the wonders and delights of the sea. Emile did not know how he was aware of these details, not yet anyway, but he sensed that the answer, and many more answers to questions unasked, lay ahead of him, deep within the bubblecity.