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40d:Chasm
Chasms appear similarly to rivers, but are not visible on the Local/Region/World maps. They are similar to the DFv0.23 chasms except that they are not guaranteed, seem to use the same river-generation code for the fortress map (a "chasm tributary" has been observed), and are bottomless.
A chasm may be open to the top of the mountain, or it can be hidden underground until discovered by a miner.
Chasms are much more common on named mountains and volcanoes, along with other special features such as cave rivers.
The presence of Extreme Cliffs (20+) on the Local Map may be, but is not necessarily, indicative of a chasm.
Chasms can also appear in a rounded shape, as below:
Uses
These uses are meant to be used with the lowermost level of the chasm. (Where you can see no lower)
Platform-chasming
A technique of building a platform over the chasm, and then severing the platform from the wall, can permanently dispose of garbage or excess stone set on top. The severed platform will disappear into the darkness below, and never be seen ever again.
Garbage dump
It is possible to chasm refuse as it was in earlier versions. Designate a garbage dump activity zone over the chasm and adjacent walkable tile. Monsters may also spring from the chasm, and were provoked by the chasming of refuse in previous versions. It is unknown if these events still occur. Given that this technique still works, you can dump anything in your fortress by selecting k and marking items for dumping. Also you can use standing orders to dump particular types of refuse. Dwarves may cancel the dump task due to creatures in the chasm below, even if those creatures can't reach them v0.27.169.33f
Bone supply(?)
Needs confirming - based on older version technique
Monsters will spring from the chasm on some occasions. Provoking these attacks and dealing with the monsters on a regular basis makes a nice bone supply. Chasm creatures also present excellent training opportunities for military dwarves.
Hazards
Dwarves fighting near the edges of cliffs have a propensity to dodge right off the precipice, falling to their deaths.
The chasm is also home to many types of hostile creatures, including iron men, troglodytes, giant cave swallows, antmen, giant cave spiders, ratmen, and batmen.
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