Since then, the river water flows through an underground channel to the Oostplein.

Water was transported from it using underground channels.

There had to be an underground channel to the "inner core."

At nineteen, she didn't know yet that minds have underground channels and obscure corners in which much of the main action takes place.

The rest of the river was diverted into underground channels in the 1960s with the highway construction.

This forms an underground channel that becomes a lava tube.

When he swam through the underground channel of the river Yauza.

There is always something mysterious happening on the mountain, which has an underground channel.

Harry remembered that there was an underground channel that led to the lake.

A sough is an underground channel for draining water out of a mine.