ICEMACHINE
Fortress Defense Intruder Flash-Freeze Device
Operator's Manual and Warning Notices
The Icemachine is a semi-automated device which may be used to flash-freeze invaders and unwelcome guests to your fortress. The flash-freeze process is guaranteed to kill any creature (other than incorporeal or permanently alight creatures) yet preserves the intruder's corpse and inventory for recycling. Operation is simple, requiring only two levers to activate, although manual cleaning is required after every usage.
Note: The Icemachine has yet to be tested. Specifications given here are extrapolated from the design. Actual performance may vary.The Icemachine is equipped with a variety of bait items to entice invaders or building-destroyers into the freeze channel, where they may be flash-frozen for later processing.
Layout of the Icemachine is as follows:
The topmost layer of the Icemachine (not counting the channels to the surface) contains the operator's control levers, and the access passage for maintenance and repair. Two levers are present, conveniently near each other and near the machine, both with labels clearly indicating their use.
The lever labeled 'Access' controls the gate connecting the freeze channel to the surface, as well as the gate connecting the freeze channel to the fortress interior. These two gates are interlocked such that one is open while the other is closed. This ensures that at no point will a clear path be available through the Icemachine connecting the fortress interior to the surface outside the fortress. When the Access lever is in the 'off' position, the gate connecting the freeze channel to the surface is open, and the gate connecting to the fortress interior is closed. In this mode invaders can travel into the freeze channel to be flash-frozen. When the Access lever is in the 'on' position (shown here) the gate connecting the freeze channel to the surface is closed, and the gate connecting the freeze channel to the fortress interior is open. This mode permits the channel to be cleared after use, and the bait items to be replaced as required. When the trap is not in use, the Access lever should be left in the 'on' position.
The lever labeled 'Activate' is used to let water into the freeze channel. When in the 'off' position (shown here) the water inlet gate is sealed, and the chamber seal gates are open. When this lever is in the 'on' position, the chamber seal gates close, and the water inlet gate lets water flow through the water fill channel and in to the freeze chamber.
On the second layer, immediately below the first, we have the water inlet channel which is permanently open to the cavern lake, and the water inlet gate. This gate is usually closed. When this gate opens, water is permitted to flow into the water fill channel. We also have here the access corridor gate. This is open to permit access to the bait and freeze channel, but closes when the freeze channel is open to the surface.
The lowermost level of the Icemachine (two levels below the first one mentioned here) contains the bait items, freeze channel, fill and drain channels. The water fill channel is directly beneath the water inlet gate. When the water inlet gate is opened as a result of the operator putting the Activate lever to the 'on' position, water flows from the water inlet line through the gate into the fill channel, and then from there through the doubly-layer fortifications into the freeze channel. The freeze channel is exposed to the surface, so water which enters the freeze channel instantly freezes. Chamber Seal Gates before and after the freeze channel prevent water from leaking out, and also prevents creatures from escaping the channel. When the Activate lever is put back to the 'off' position, the water inlet gate closes, and any excess water in the fill channel drains out through the drain channels. The Chamber Seal Gates will at this point open to permit the channel to be cleared.
The External Access Gate is used to isolate the channel from the outside while clearing operations are underway. This is controlled by the Access lever. When the Access lever is in the 'on' position, this gate is closed. When the Access lever is in the 'off' position, this gate is open.
Several bait items are present to lure targets into the ice channel. Multiple doors are here to act as targets for building-destroyers. These may need to be replaced periodically. An artifact millstone is also present. This should represent a target which building-destroyers will attempt to attack but be unable to destroy. A puppy on a chain is present, to attract non-building-destroyer hostiles. This bait item is likely to require frequent replacement. Two cage traps are also present. These are not bait, but are a contingency backup against a non-trapimmune enemy sneaking past the puppy and attempting to gain entry to the fortress.
SEQUENCE OF OPERATIONS
When the Icemachine is not in use, the levers should be set as follows: Lever 'Access' is to be in the 'on' position (indicated by a lever angled to the right) and lever 'Activate' is to be in the 'off' position (indicated by a lever angled to the left). In this state the freeze channel may be freely and safely accessed by the fortress population for cleaning and maintenance. The Access lever should not be left in the 'off' position, as this may result in vandals and thieves loitering in stealth in the freeze channel where they can ambush your workers if the lever is put to the 'on' position without first activating the freeze cycle.
When a target is present on the surface outside the fortress that you wish to freeze, throw the 'Access' lever to the 'off' position. This will close the fortress access gate, denying passage to or from the freeze chamber, and open the external access gate, permitting the target to enter the freeze channel. At this point the target should be drawn by the bait and enter the freeze channel. While the target is inside the freeze channel, throw the 'Activate' lever to the 'on' position.
WARNING
Danger of death or severe injury!
When the Activate lever is put in the 'on' position, the freeze channel will fill with
ice. This will kill any creature in the freeze channel. Be sure that no children, pets,
nobles, diplomats, traders, or other creatures you do not want to kill are located
in the freeze channel before throwing the Activate lever to the 'on' position!
As soon as the channel is completely filled with ice, throw the 'Activate' lever to the 'off' position to stop the water inflow. Leaving the 'Activate' lever in the 'on' position may result in an excessive flow of water through the fill channel. After throwing the Activate lever to the 'off' position and verifying hostile creatures remain in the trap, throw the 'Access' lever to the 'on' position. This will close the external access gate and open the internal access gate. You can now have a miner mine out the ice to clear the trap, and if desired have your haulers clear out the invader remains or any other desired items from the freeze channel.
WARNING
Danger of death or severe injury!
After the Icemachine has been used to freeze intruders, some residual water may
remain in the fill channel. This water will eventually drain out through the drain
channels. If you send a miner in to clear the ice before the fill channel has
completely drained, residual water may seep into the freeze channel and instantly
kill your miner. Be sure the fill channel is clear before mining any ice!
After the ice has been completely mined out, desired items reclaimed from the channel, and bait items replaced as necessary, the Icemachine semi-automated freezing trap is ready to be used again.
Use at your own risk. The makers of this device are not responsible for any death, injury, loss of possessions, tantrum spirals, or wars which result from use or misuse of the Icemachine.