Tunnel building.

[thirty-seven]

When building snake tunnels without supports, cave-ins usually happen when u're trying to make a:
1)turn
2)crossroad(vertical tunnel crosses horisontal)

What is the best scheme for each case?

Here is how i make a turn, i suppose its the best way.
-- -- --
-- -- -- -- --
-- --
-- -- -- -- -- -- -- --
-- -- -- -- -- --
-- -- -- -- -- -- -- --
-- -- -- -- -- --

But what about crossroads?

[DatOneGuy]

You should probably use code and letters or something to illustrate your point there.
From what I understand

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☑☑☑▧☑☑☑▧▧
☑▧☑▧☑▧☑▧▧
☑▧☑☑☑▧☑☑☑
▧▧▧▧▧▧▧▧☑
▧▧▧▧▧▧☑☑☑
▧▧▧▧▧▧☑▧▧
▧▧▧▧▧▧☑☑☑

For 'crossroads' or 'hubs' or '4 way points', I'm still unsure of a 'good' way to do it, but I think it can be done.

[thirty-seven]

...use code and letters or something to illustrate your point there...

Okay.
And yes, u understood correctly

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xxx xxx
x x x x
x xxx xxx
        x
      xxx
      x
      xxx

[Saphireking65]

make a mine support if you don't want to risk a cave in.

[thirty-seven]

*image*

Is this the best possible way?
What about this one?

Int your example, longest line is 5 tile long, here it's 4.

[Sevenless]

Still that 1 tile is a true blue "unsafe" tile.

[DatOneGuy]

It would also be strongly preferred to have all intersections meet at one point, not be slightly off.

[thirty-seven]

Still that 1 tile is a true blue "unsafe" tile.

Is there any way to roughly calculate the probability of cave-ins?

[DatOneGuy]

Still that 1 tile is a true blue "unsafe" tile.

Is there any way to roughly calculate the probability of cave-ins?

Even if there was, with the chance of getting shitsmacked by 2+ caveins or other such things, even for just 'one' chance, it ain't a good risk

[Sevenless]

Still that 1 tile is a true blue "unsafe" tile.

Is there any way to roughly calculate the probability of cave-ins?

Even if there was, with the chance of getting shitsmacked by 2+ caveins or other such things, even for just 'one' chance, it ain't a good risk

LS of a village I know just died randomly. He was snaking on lvl 3, instadeath from full HP.

Honestly it's worth it just to drop a support at the center. They're not THAT hard to build.