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[BigD145]

The game dat file is just a compressed archive. You can modify things in it.

[Aklyon]

Its not like you need to read the bios even, unless introversion added generated bios for all the random prisoners.

[miauw62]

Hm. Is there any way to prevent tunnels without shakedowns every night?
I have dog handlers patrolling around my cell blocks all night, and they've never thrown up anything but false alarms, but I've had two prisoners escape already.

[forsaken1111]

Even a shakedown isn't guaranteed to find the tunnel. The only sure way is to dismantle the toilets. I do prisoner rotations regularly. I leave one cell block empty and dismantle the toilets in another, invalidating the cells and causing the prisoners to be transferred. Collapse any tunnels, then move them back in later on or move the next bunch. I only do this once some dogs have alerted though, or sufficient time has passed, or a prisoner escapes.

[JimboM12]

Hm. Is there any way to prevent tunnels without shakedowns every night?
I have dog handlers patrolling around my cell blocks all night, and they've never thrown up anything but false alarms, but I've had two prisoners escape already.

Metal detectors at your prison block entrances will reduce or outright stop tools from getting into cells, and stop tunneling. Other than that, I'd shakedown once a week during night hours when they're all asleep. Also, I use small pipes for water in the cells, and limit the large water pipes to a single line straight from the water pump, so even if the tunnelers get into it, they have nowhere to go. This actually gives me an idea; what if you have an inner ring of large pipes around your prison? Would the tunnelers hit it and get stuck?

[forsaken1111]

This actually gives me an idea; what if you have an inner ring of large pipes around your prison? Would the tunnelers hit it and get stuck?

No. As I understand it, large pipes just make it easier to move through those tiles. If the pipes don't go the way the tunneler wants to go, he wouldn't follow them.

[JimboM12]

This actually gives me an idea; what if you have an inner ring of large pipes around your prison? Would the tunnelers hit it and get stuck?

No. As I understand it, large pipes just make it easier to move through those tiles. If the pipes don't go the way the tunneler wants to go, he wouldn't follow them.

Dang, there goes my AI breaker idea. Ah well, the traditional ways of finding tunnels is the way to go then.

[Puzzlemaker]

I believe there is a type of wall you can build the extends below ground.  They will automatically try to path around it, so you could theoretically make a choke point that all tunnelers will dig through.  Just periodically check that one point.  Would require a bit of setup though.

[Aklyon]

I believe there is a type of wall you can build the extends below ground.  They will automatically try to path around it, so you could theoretically make a choke point that all tunnelers will dig through.  Just periodically check that one point.  Would require a bit of setup though.

Perimeter wall.

[miauw62]

The thing is, my dogs don't seem to be doing *anything* against tunnels. I have found no tunnels because of dogs, they've always been false alarms, as far as I can tell.

Also, I've modified the main.dat file to remove the majority of the shitty custom bios. I've left a few in, mostly sanitized. It makes me very happy that it's really just a .rar archive (and that there is no validation, thank god)

E: also, nobody seems to be interested in the education programme, which sort of sucks.

[PanH]

E: also, nobody seems to be interested in the education programme, which sort of sucks.

You're oppressing your prisoners too much. They need to have a low repression to take classes.

[forsaken1111]

I believe there is a type of wall you can build the extends below ground.  They will automatically try to path around it, so you could theoretically make a choke point that all tunnelers will dig through.  Just periodically check that one point.  Would require a bit of setup though.

Perimeter wall.

Keeping in mind that said wall does not PREVENT tunneling under, and if the only way around the wall is a very long way off then they will indeed take the time to go under instead.

[miauw62]

E: also, nobody seems to be interested in the education programme, which sort of sucks.

You're oppressing your prisoners too much. They need to have a low repression to take classes.

Ah, that might explain it. After some fights in the canteen I thought it a good idea to permanently station an armed guard in the middle of the canteen...

[Zangi]

Hm. Is there any way to prevent tunnels without shakedowns every night?
I have dog handlers patrolling around my cell blocks all night, and they've never thrown up anything but false alarms, but I've had two prisoners escape already.

1. Metal detectors are absolutely required.  Put em at the entrances to the cell block and/or if you have some sort of mega cell block, put em at the entrances of places that generate tools like the canteen or workshop.
2. Dogs patrolling inside the cells blocks/rooms.  Sure, they probably don't sniff out tools/weapons, but the can get the other contraband.  Which leads to #3...
3. Policy of searching the cell and sending to solitary for any possible infraction.  They lose their cell and it gets searched, which helps with the rotating...
4. Make sure to search and double search new/recently constructed cell blocks, just in case stuff got in before the metal detector chokepoints were set-up.  And maybe that issue of stuff slipping past in construction material.

I've left the game running for hours and have had no escapes, barely any tunnels either, since they tend to be found quickly.

@Dogs patrolling outside/around the cell block, the chance for the patrol to be right over the tunnel while the prisoner is digging/passing through is very very very low.  I don't think I've ever caught one like this.  Basically your dog patrol probably can only sniff around 3 or 5 tunnel tiles at most. 
Most tunnels would dig straight from the cell block to the fence/exit.  Which means if your dog patrol circles around the cell or the whole prison, there is a minimum chance to find tunnels via dog.  And even if you try to build it so that your dogs patrol between cell block to exit/perimeter, you'd have to do a lot of perimeter fence sorcery and what-not to try to control the likely tunnel paths, if they don't just decide to dig straight under anyways.  Also, having to consider the fact that you are still running a prison and your prisoners still have needs.  So you need a bit of extra real estate to implement this per cell block.

[miauw62]

I do have metal detectors at every cell block. And I'll move the dogs inside, I guess. I didn't realize they only work if somebody is actively digging.
I've moved my armed guards outside my perimeter to reduce supression, so hopefully not all escape attempts will work now.
I guess I'll move my dog patrols inside (they already patrol around the entrance to the canteen at lunchtime, e.g. when most prisoners go through a 3-tile-wide chokepoint)

E:
Heh, just got a prisoner that is both ex-law enforcement AND a snitch. Didn't see his stats, but now he's dead.

E2:
Oh man, I just went over capacity by 20 prisoners by forgetting to turn intake off. I have a single minimum size holding cell...