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[Bomepie]

I've just decided to start a megaproject for to rival the Megadorf. I modded the worldgen to give me 100z levels of sky to work with but otherwise left it unchanged. I found a nice perfectly flat embark with a river and trees, but I also got a pair of 30+ diameter holes going all the way down to the magma sea. One of these holes neatly interrupts the river.

Spoiler (click to show/hide)

I'm not exactly complaining about these, though the fps loss from the one with the river dumping into it will be annoying, and I see many ways to build them into my megaproject. Mostly I'm just wondering what the deal with these is, are random craters a feature of this latest version of DF?

[ThrowerOfStones]

Look like empty volcanoes.

[Cotes]

Awesome. I think it's a bug, but above grounds pits like this should be intended behaviour if you ask me. Maybe not all the way to magma though.

[Girlinhat]

How deep?

[Naryar]

You got 2 emptied volcanoes in a 4x4 embark ? 

[Bomepie]

The depth is 13 on the river one and 15 on the other. Pretty shallow compared to what I'm going to be building I guess.

[Urist Imiknorris]

I think they were supposed to be magma pools, but something went wrong.

Kind of like the empty volcano bug.

[Girlinhat]

Dig them deeper and make them into some form of sacrifice pit?

[Bomepie]

I've decided to use the pits as a handy way to bypass the aquifers. I've also noticed the river pit is not capping up and turning into a lake because the water lands in a shallow section of the magma sea and the obsidian instantly melts.

I am suddenly considering cracking the aquifer open and pouring it into one of the pits. I wonder if it could ever overcome the obsidian melt speed.

[Cotes]

I've decided to use the pits as a handy way to bypass the aquifers. I've also noticed the river pit is not capping up and turning into a lake because the water lands in a shallow section of the magma sea and the obsidian instantly melts.

Would turning off cave-ins for a while fix that? Not that redirecting the river itself should be that hard either.

[ThrowerOfStones]

I've decided to use the pits as a handy way to bypass the aquifers. I've also noticed the river pit is not capping up and turning into a lake because the water lands in a shallow section of the magma sea and the obsidian instantly melts.

I am suddenly considering cracking the aquifer open and pouring it into one of the pits. I wonder if it could ever overcome the obsidian melt speed.

Is the obsidian melting or caving in to the semi-molten rock?'

'Cause it really shouldn't be melting.

[Bomepie]

I look at the bottom of the pit and see a water hitting magma but no obsidian. I am not getting cave in messages.

As far as river redirection goes: I don't think this biome freezes and the river is coming from the south so I have about 5 tiles from the map edge to redirect it. I was think about building a bridge for the river. many dwarves would probably die in this endavor.

[ThrowerOfStones]

I think the bottom layer of magma can't obsidianize.

[Uristocrat]

Upload the save to DFFD?

[Bomepie]

I think the bottom layer of magma can't obsidianize.

That's sorta lame, I guess there's ways around this if I really wanted to make them. As cool as an everlasting drainless waterfall would be the fps loss would undermine the megaproject.