"Do we go in here, or keep on ahead?" he demanded.
The tunnel lights ended a short distance ahead.
"In here," said Tina. "There are stairs leading upward to the catwalk balcony corridor halfway up the dam. We are not far from the Power House now."
They then ascended interminable moldy stone steps spiraling upward in a circular shaft. The murmur of the dam's spillways had been faintly audible, but now it was louder, presently it became a roar.
"Which way, Tina? We seem to have reached the top."
"Turn left, Tugh."
They emerged upon a tiny transverse metal balcony which hung against the southern side of the dam. Overhead to the right towered a great wall of masonry. Beneath was an abyss down to the lower river level where the cascading jets from the overhead spillways arched out over the catwalk and landed far below in a white maelstrom of boiling, bubbling water.
The catwalk was wet with spray; lashed by wind currents.
"Is it far, Princess? Are those lights ahead at the Power House entrance?"
Tugh was shouting back over his shoulder; his words were caught by the roar of the falling water; whipped away by the lashing spray and tumultuous winds. There were lights a hundred feet ahead, marking an entrance to the Power House. The dark end of the structure showed like a great lump on the side of the dam.