A normal metal detector finds cell phones though right?

Thank You! I didn't know because when i created a new prison i turned fog of war off, but it stays on anyway. Thanks for the help!

When i was making my prison (and doing pretty well with it 8) ) i noticed that some of my rooms went dark and grey. The power station was fine and working properly. and the lights were also grey and not working. I dismantled them, and the electricity cables, and put it all back, to find out that the...