Cannot bring pipes down into mines

I'm using an old mine for a train station. It sits below sea level. The problem is that I cannot even place pipes level with the train station above ground.

I read an earlier post where the dev stated that the game forbids placing pipes below the world floor? This is false, I have been able to do this since the first release of this game.

Disabling the mod allows normal placement.
(I want to be clear, I'm not accusing the dev of lying it could just be bad translation/english)