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Underground Sluices

The only issue is that, until you build a sluice, will have a huge leak if water level is above the tunnel. That's this mod, to have sluice built right away.

You can already do this. You just make the tunnel, destroy the platform, then build the sluice. No mod required.

Fair enough, I was thinking about drainage tunnels going off the edge of the map where this would be the last 2 tiles! I'll just have to rethink my builds!

codeless it's imposible. Indeed, it's intended that sluicec to be at the end of a tunnel to work

Would it be possible to make this mod so that if you are building a big drainage tunnel, you could clear both blocks in the direction of the flow (1x2 building), otherwise you have to clear the path in front before you can build a sluice, almost making this redundant unless it's at the end of the tunnel with a space!