After several minutes of running, the corridor widened into another room.

The corridor widens into a blotch from which the youth case is cut.

Then the corridor widened and the ceiling retreated, until the passage was again comfortable for humans to walk through.

Soon the corridor widened and a large cavern opened up before them.

The corridor was widening, spreading into a huge underground cave.

The corridor widens in the end into a small blotch.

After a long time the corridor widened and there was light.

At the end, the corridor widens into a large blotch.

At one place the corridor widened into an observation lounge with chairs and small tables.

They were both worn out several hours later when their corridor widened into a huge factory area with a very high ceiling.