Shorts at Rochester, WWII

I watch a lot of videos by IKS Exploration, where they explore the maze of underground tunnels in Kent.
As well as Cold war observation posts, RAF installations etc.

In their latest video, they are in the underground tunnels under Rochester. These tunnels were first used by Shorts to
manufacture aircraft parts. Does anyone have any more detailed info on what they made ?, other than what is readily
available to read about on the Internet.