Hello Majors, and welcome to my "Underwater-Neighrourhood-Connection" Tutorial. With those kind of Connections, you can let everything move, even Freight. We dont need Metros for it, only Roads or Tracks. What is needed? Not that much. First of all... the "sealevelzero.Dat" (Made by the NAM Team) is for sure needed: _sealevelzero.dat And the Hole Digger from smoncrie: Hole Digging Lots V2 (Not on the LEX): https://community.simtropolis.com/files/file/3599-hole-digging-lots/ Thats all ;-) Let´s get startet.  We even the Ground around the future Exit from the Highway and Rail Yard Tunnel by using Street Tiles. We are using the Hole Digger (15 Meters) to made our Tunnel Exit (i did it for the Highway befor): It should looks like this after: In the "Holes", our future Tunnels will end. Go out of the Game (dont forget to save) and put in the DAT File in your Plug in Folder and restart the Game/City. It should be looks like in the following Picture... all the Water is gone (temporäry). Now we set a "Mark Line", so we dont need to scroll left/right all the Time. Even the Ground at the End, like you see in the Picture: Set the Railway and the Highway to a Neighboorhood Connection and rieser 2 Tiles away up to 15 Meters: Even the Ground by using Street Tiles. Delet all Street Tiles out of the Exit´s: And set the Highway Tunnel: Same with the Railway: The 1st City is done, let us switch to the other... follow me ;-)...   Built the Railway and the Highway like befor: ... and the other City is done: Thats how it looks like without any Water: Thats it, save the Work and go out of the Game. Remove the sealeavelzero.dat out of the Plug in Folder and restart the Game. After restart at City, the Water will be back (after you enteryed a City). Let us see, if the Networks are working, like they should be: And the Trains?: The other Side with Highway Freight: Thanks for your Attantion. Hope my English wasnt that bad, like i think ;-) I´ll be back with the next How Too soon. Greetings, Oliver