Step Well

When we think of being subterranean, we immediately think of being "under" ground, but this is not always the case.For some reason, photos of stepwells (bawdi, or baoli, or vav, in Indian dialects) have been tumbling out of 'blogs lately. Perhaps it has to do with the increasing interest in ecologically sustainable lifestyles. Stepwells are in most cases ancient Indian structures built in part to make use of a three-month monsoon season in the course of an entire year, but they have also come to serve cultural and religious purposes. To this end, the stepwells can be beautifully and ornately decorated. The structure of the steps themselves is a simple, pleasing pattern, but look to this post on DesignFlute for examples of how ornate and unique a stepwell can be.In essence, stepwells serve two very basic functions: to collect rain water, and to make it accessible. This account for the enormous basin shape, and the steps. From there, the designs can vary wildly, in part because these structures don't present any of the dangers of reservoirs or other continually renewing or flow-based water management structures. When the water only comes once a year, you might imagine a great deal of ritual can be built up around it, and the common necessity for these structures from place to place also inspires people to take creative responsibility, and identify with the particular details of their design and structure.
Stepwells present all sorts of fascinating combinations of pragmatic use and cultural significance, including a certain synergy of design and natural process. The silt that gathers in these structures comes to act as a natural water filter, for example, which is a quality that can be appreciated by animals as well as humans. One can imagine, too, the way in which a stepwell being the primary source for water during most of the year can develop into elaborate rituals and an appreciation for simple quantity. Just imagine the excitement and bounty of an enormous, full basin of clean water, and very gradually watching as it sinks lower, and lower, revealing more and more layers of steps to traverse, as the year progresses.Not all stepwells are wide-open to the sky, either. Many have structures built across their upper levels that allow rain through, but also provide shade and useful rooms and sub-levels for various uses in the drier season.
And then again, there's the steps.

Oh, those steps...
I have to imagine that every community has one or two epic legends about folks taking a tumble down the local stepwell just before the monsoon season, when it would take a particularly long (and jarring) time to reach the inevitable conclusion. I can't help but wonder, too, if some folks get especially adroit with maneuvering on those myriad pyramid-like step structures. Errol Flynn truly missed a great environment for showcasing his legwork, that's all I'm saying further on the matter.
Stepwells are water temples. They represent a magnificent, ancient solution to an absolute necessity.

Profound thanks to InfraNet Lab for a far more informative, yet somehow succinct, explanation of the function of these structures than any other source I was able to find.

Urban Stalactites

Spotted on the uptown-bound platform of the 4/5/6 last weekend. At first glance I took them for the usual peeling paint that can appear on the ceilings of the older subway tunnels (and given what paint used to be made of, isn't that an appealing thought?) but I soon recognized these miniature stalactites for what they are.

Natural stalactites are the result of dripping limestone elements that recombine in almost palindromic chemical reactions as they make contact with water and air, respectively. Stalactites can also form, however, on concrete, through a more rapid reaction fueled by the calcium oxide found in concrete. It's interesting how natural processes can inform a man-made structure -- we tend to focus on the reverse, but nature always has the last word.

Bats via Infravision

Remember how in early D&D some races had "infravision" which was essentially thermal predator vision? This is what the entrance to the bat-infested cave system looks like to an elf:


I always thought I wanted infravision, but now it seems a little, well, terrifying. (edit: Of course I still want it though. Don't be silly.)

Via Wired

Lithoautotrophic Cave Engineering

Via Boingboing:

Lechuguilla Cave is part of the Carlsbad Caverns Natural Park in New Mexico and is regarded as one of the most beautiful caves, with some of the most unique geography, in the entire world.

You can't visit.

Because of the delicacy of many of the formations, the cave is only open to scientists and the explorers who are still figuring out what all is down there. Nobody else is allowed in. Or, rather, nobody else but David Attenborough.

This video from the Planet Earth TV series takes you down into Lechuguilla for some amazing sights and fascinating commentary on the chemistry and biology that make this cave so strange and lovely. Even more impressive, nobody knew it was there until 1986.

Psst, Nova has a whole page on Lechiguilla, if you want to read more.

I love that sentiment expressed at the end, that there may yet be many more such subterranean wonders beneath our feet. I also would like to know more about "extremophile bacteria feeding on the very rock" - could their processes be sped up and controlled to create planned caves in a less-than-geologic timescale?

Probably not, but its fun to imagine voracious colonies of lithoautotrophic bacteria carving out new chambers, selectively killed by spraying bleach or some other deterrent or fostered by spreading the dust of their favorite mineral compounds in the direction the cave engineer hopes they'll grow. Imagine if such a colony could grow cave systems on the order of feet per day. Let's limit their behavior to keep from excessive cave-ins by imagining that they leave behind directional cave systems that gradually wind their way down into the earth, with occasional branches but not expansion in every direction. In other words: they create lairs.

Warning: I am not a chemist: What will the bacteria leave behind? Well, as limestone is primarily CaCO₃, they'll be breaking it up and creating gorgeous, semi-organic-looking calcium deposits, and it'll be releasing carbon dioxide and oxygen into the air. Would lithophagic bacteria leave behind breathable cave systems? Let's imagine so. Let's also say they're of value to miners, because if you point them at a vein of rock with your favorite precious metal in it, they'll leave it lying around as they pass through it and you just sweep it up in their wake.


In an even more fantastic setting, you could have the equivalent of Gelatinous Cubes, but these 10' cubes eat inorganic matter instead of organic stuff. They excrete a solvent for rock, but only on one side of the cube at a time. Unfortunately they are impossible to control or predict, but their likely movements have carefully been modeled as a particular set of random dungeon-generating tables! All you have to do is add doors, denizens, and treasure! It's a bit over the line from where I like my fantasy, but if you're in a pinch to justify miles and miles of endless dungeon that no sentient being in his/her right mind would ever create (see how I carefully excluded us all there?), you might need rock-eating-cubes doing all your dungeonbuilding for you.

If you do have such things actively building in an underground setting when delvers, adventurers, or other denizens take up residence, it might be fun to track where they are and where the expansion is happening. Like the miners who sweep up gold dust in the wake of our lithoautotrophs, it might benefit a party to hang behind an excavator cube as it works, waiting to see if it connects them to an otherwise hard-to-reach part of the delve (while you roll dice on the 'excavator-cube-movement' [aka random dungeon] table to see what it does).

Or maybe you, a dungeon designer and builder, need to hire some delvers to go deep into the mazes created by such things in order to have them harvest autolithotrophs to bring to your nascent dungeon to get it started or help with that wing you've been meaning to expand. You'll have to pay them well, and I recommend not telling them the actual location of your underground construction lest they come and raid it later, but if you're looking to get your hands on these kinds of creatures, you don't really have many more options than to have those loathsome adventurers go on an underground retrieval mission for you.

Subterranean Mushroom Farming for Pros

Edible Geography has an excellent post on the Li-Sun Exotic Mushroom Farm in Australia, which can serve as a good start to investigating what a large underground food production operation looks like.

Logistics: Li-Sun grows at least eight varieties of edible mushroom, and several varieties of medicinal mushrooms as well.

The tunnel for which these mushrooms have been so carefully developed is 650 metres long and about 30 metres deep. Buried under solid rock and deprived of the New South Wales sunshine, the temperature holds at a steady 15º Celsius. The fluorescent lights flick on at 5:30 a.m. every day, switching off again exactly 12 hours later. The humidity level fluctuates seasonally, and would reach an unacceptable aridity in the winter if Dr. Arrold didn’t wet the floors and run a fogger during the coldest months.

Based on the pictures of the racks they're using, it looks like you can fit ~84 mushroom logs per 5' square area devoted to growing, including room for walkways. It says logs are "made by mixing steamed bran or wheat, sawdust from thirty-year-old eucalyptus, and lime in a concrete mixer, packing it into plastic cylinders, and inoculating them with spawn", but for the sake of argument lets just say you'll be using some decaying vegetation from your nearby forest, used straw from your farmworkers' bedding, bat guano you collect from the pigeonholes your local bats roost in, and plenty of night soil from your growers and the other denizens of your subterranean community. The article also mentions that (at least in the case of Shiitake mushrooms, which he says are the most troublesome to grow) a log is crops after a week of exposure in the light, then goes dormant for about 3 weeks, then is productive again for 3-4 weeks. Let's imagine that every log produces half a pound of mushrooms over a productive week (I made that up, but its maybe believable). Thus, a single log of shiitake produces about 2 lbs of mushrooms over a 2-month-or-so span of time if my productivity guess is somewhere close to reality. Meaning a 5' square growing area produces around 20 lbs a week on average if it can be kept productive.

Of course, that space calculation only applies to growing space, which must receive light somehow for part of the day and be kept at the proper humidity. You'll also need a fully dark place to keep your dormant logs, but as these can be packed without regard for growing space and the logs are dormant for only 3/8 of the growing weeks, you can probably get by with 1/10 as much dark space as growing space, if you put in some nice shelving to keep things organized.

Of course, you'll also need a master mushroom grower and some obedient workers who can harvest the mushrooms, keep the floor properly wet, and rotate growing logs to and from the dark as appropriate. If you're using a humanoid tribe as your crew, your shaman or medicine man may already possess the requisite growing knowledge or be willing to learn it (otherwise you'll have to bring in an outside specialist, which is definitely going to cost you more of the profits). While your males form your war-party and go raiding, hunting, and trading, your females and younglings can be kept reasonably occupied tending the farm.

Economics: Not only are mushrooms a good food source, but some varieties have noteworthy medicinal, hallucinogenic, poisonous, or (depending on your locale) magical effects. You'll want to balance your growing operation to provide as much cheap food as possible for your growing crews and their families, while maximizing the trading possibilities for your surplus crop. Probably this means growing quite a few more edible mushrooms, but special mushrooms can bring a much higher premium for particular clients willing to pay for them. Here's a list of possible client preferences:

• Demonic cults will often be interested in hallucinogenic mushrooms for their ceremonies


• Assassins may be willing to pay a premium for particularly potent poisonous mushrooms, but you'll have to balance that against the dangers of growing them


• Wizards and witches often have need of particular mushrooms as spell components - at first these will probably be special orders but as you gain a sense of what varieties they require you can expand this part of your growing operation


• If your growers can function in complete darkness, they can grow so-called 'shriekers', which emit a high-pitched noise when light falls upon them. These are useful both around the perimeters of your community (where intruders using light are likely to trigger them, and as trade items for other dark-dwelling denizens.


• Check with your local sages or shamans to find out more about the local varieties available to you

Happy growing!