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[catten]

OK, so I was trying to drain my embark's volcano following these instructions (dump water from above, let the obsidan cave in and be destroyed by the SMR below).

I channeled down to a nearby aquifer, built an aqueduct whose spout hung 2-z over the center of the volcano, and connected the two with several pumps:

╔═════════
║.++++++%%▼
╚═════════

The first 1/7 water hit, and caused a cave-in as expected. Great magma sea discovered.

The second 1/7 hit, and caused another cave-in. Raw adamantine, tons of gems, and a few ores discovered.

The third 1/7 caused a cave-in, but also formed a block of obsidian that plugged the water spout. "Eh?" I thought, "That's weird" What's even more weird, though: the tile below that obsidian block *also* contains obsidian. In fact, a column of obsidian extends 160+ z-levels down to the very bottom of the magma sea, with just one empty tile between it and the semi-molten rock.

I just don't see how this could be possible, especially since I only managed to pump about 4 units of water out of the spigot before it plugged.

Save uploaded here, with the spigot loaded with water and ready to start dropping blocks of obsidian to the bottom. Just unpause and watch the fun. You might need to turn the pump back on if the water in the pipe isn't enough to trigger the bug.

Any idea what's going on there?

[vjek]

Volcanoes are reverse singularities.  They're infinite sources of Armok's Blood, but trying to enter them stretches items infinitely long into a single pixel thin line as you approach the event horizon.  Thusly, your 4 waters were stretched over 160Z levels, while trying to pollute Armok's Domain with your unholy liquid.

(no, i have no idea what's going on )

[Max™]

I'm gonna go with vjek and his armokingularity explanation.

[catten]

I'm gonna go with vjek and his armokingularity explanation.

Works for me. Besides, I just realized that this will actually make it easier to colonize my volcano!

Instead of this:
╔═════════
║.++++++%%▼
╚═════════

I need something more like this:
╔═════════════╗
║.+.+.+.+.+.+.║
║+.+.+.+.+.+.+║
║.+.+.+.+.+.+.║
║+.+.+.+.+.+.+╚══
║.+.+.+.+.+.+.++%%▼
║+.+.+.+.+.+.+╔══
║.+.+.+.+.+.+.║
║+.+.+.+.+.+.+║
║.+.+.+.+.+.+.║
╚═════════════╝

As each new hole plugs w/ obsidian (creating a 160-tall column) water can reach the ones beyond it. Once all the holes have plugged, cave in the whole shebang.

[danmanthedog]

I'm gonna go with vjek and his armokingularity explanation.

The true meaning is Armokology which to first study it you must decepher this riddle; "Thy must bond with the blood of the old great slave master." Also I would think physics broke so  maybe that's what happened.

[Naryar]

How the hell ? 4 units of water means 24 tiles of obsidian being created, at the very maximum, and even though water falls by entire units, not 1/7 units.

but this may be interesting in case i want to solidify a volcano and make an obsidian fort...

[catten]

How the hell ? 4 units of water means 24 tiles of obsidian being created, at the very maximum, and even though water falls by entire units, not 1/7 units.

Make that 4/7 water, falling 1-2 at a time... which just makes it that much weirder.

[Sergarr]

Obsidian water drill?

[Ravendarksky]

I think your issue might be related to our attempts at a dwarven submarine: http://97.107.128.126/smf/index.php?topic=134907.msg4872739#msg4872739