The coldness of the water seeped through my leather boots, numbing my toes.

Behind us, the grinding sound suddenly stopped.

It was replaced by a heavy splash.

Someone had dropped down from the hatch.

“They’re in,” Sullivan gasped, looking back over his shoulder.

“Don’t look back,” I said. “Just run.”

We rounded a sharp curve in the brick wall.

The tunnel split into two separate paths.

The path on the right was dry but narrow, barely wide enough for a person to walk through sideways.

The path on the left was wider, but the water was deeper and flowing faster.

“Which one?” Sullivan asked.

I shined my light down both paths.

The right path seemed to go upward, away from the river.

The left path had a faint, grey light at the very end of it.

“The left,” I said. “That leads to the water.”

Before we could take a step, a bright beam of light cut through the darkness of the left tunnel.

It did not come from behind us.

It came from the exit ahead.

“Stop right there!” a voice shouted from the end of the left tunnel.