Construction Process
The construction process for installing underground transmission cable lines involves the following five key steps.
![installing vault](https://cdnc-dcxprod2-sitecore.azureedge.net/-/media/images/oru/04_energy-future/43_ourenergyprojects/line-705/vault-installation-cd.png?rev=ebfd1465d00a4d00a690b9a7db94ec1a)
1. Vault Installation
Install vaults underground in intervals along the route for cable splicing.
![installing ducts](https://cdnc-dcxprod2-sitecore.azureedge.net/-/media/images/oru/04_energy-future/43_ourenergyprojects/line-705/duct-installation-cd.png?rev=e129955723a54200bcfb0b8aeffec6ae)
2. Duct Bank Installation
Prepare roadways with underground duct banks where new cable is installed.
![restoring the road](https://cdnc-dcxprod2-sitecore.azureedge.net/-/media/images/oru/04_energy-future/43_ourenergyprojects/line-705/restoring-road-cd.png?rev=2e3181eabea04e139a9fbd57b0d7a813)
3. Restoration
Restore excavated areas after completing vault and duct bank installation.
![installing cables](https://cdnc-dcxprod2-sitecore.azureedge.net/-/media/images/oru/04_energy-future/43_ourenergyprojects/line-705/cable-install-cd.png?rev=53caf5068bec49828cde45cc8d42626d)
4. Cable Installation
Take underground cable from a truck and pull cable from one vault to another.
![splicing cables](https://cdnc-dcxprod2-sitecore.azureedge.net/-/media/images/oru/04_energy-future/43_ourenergyprojects/line-705/cable-splice-cd.png?rev=f7b582d575344f9b909ef0133a7c2923)
5. Cable Splicing
Set up at each vault location to splice the underground cable together.