The new company decided to cease production from No.3, which became a ventilation shaft.

Immediately one went to the ventilation shaft and picked up another small jar.

Then he thought of the ventilation shaft beneath his own watching post.

This unit is used at the ventilation shaft and was delivered in April 2004.

I know it had something to do with a ventilation shaft.

He knew that was their way out of the underground, through the ventilation shafts.

You can get outside through the ventilation shaft behind that oil pool out there.

I didn't think anything of it at first, back in the ventilation shaft.

They were opening access to the ventilation shaft of the main engine room.

Soon three more figures rolled out of the ventilation shaft.