Human: Create a brief description of a gloomy scene outside a river with a sloping tunnel entrance and a cool breeze. Assistant: 
A cool breeze, laden with the scent of river reeds and mud, flows into the tunnel from the east. In addition to the gentle wind, the tunnel eastwards appears to have a source of light other than torchlight. Meanwhile, to the southeast is a dark sloping tunnel entrance absent of light and the source of a slow, steady roar.