How do I fill in tunnels dug by prisoners?

[Roborule]

I have discovered tunnels dug by my prisoners, but I am not sure how to fill them in. Help!

[Chlorax]

Materials => Remove Tunnels

[Roborule]

Thanks! I cant believe I didnt see that. :P

[Chlorax]

No prob! it took me along time to figure it out. (I always thought the guards would fill it in automatically.) What I tend to do is wait for every prisoner to goto the yard and then I order my guards to search the entire cell block (via clicking on a bed or toilet) in order to find the tunnels before someone escapes. Another thing to do is research punishments (if you haven't already) and have the guards search prisoners cells when found with tools from metal detectors