My greatest concern is in accounting for human error when I make the initial breach. I would like a design that will work even if my initial breach is off-center, and even if the mining dwarfs cancel their designations and immediately flee. In the scenario that I am envisioning and for which I should like to prepare, there is only a single tile that breaches the hollow spire and it is not centered. The adamantine spire may also not be straight or semi-straight. The goal of this endeavour is to breach Hell safely, and to plug it so that I can get at the hollow adamantine spire without having to deal with a horde of demons.
To this end I had thought to use liquids rather than solids as my filling material. My understanding of the relevant physical properties of magma, obsidian, and water are that the second is formed whenever the first and third meet; so, I was hoping perhaps to build reservoirs of both, then pour first one and then the other down the drain. The problem with this is that I have no idea how I would situate these reservoirs or how I would time their release to be useful. If one is dumped down the spire and allowed to just spread out, then no good comes of this; if both are dumped too quickly, perhaps they will meet and form obsidian before they are sufficiently far from their reservoirs to be useful.
In designing this project I am trying to identify in advance and work around problems. The idea of a solid mass being dropped seems like it would work for a straight spire whose entire mouth has been revealed, and probably that is what I will go with for my first attempt at this; however, I think we would benefit from discussing the ways to create and use a liquid-based system as well.
Yeah. Might want to change that to at least "On Breaching HFS", or "Preparing for the Carnvial" or something.
What nonsense is all this?
Bit SPOILER-ish name, isn't it?
What are you on about?