Gasunie intends to integrate the cavern A1 into its existing underground gas storage (Aardgasbuffer Zuidwending). There are two wells in the cavern that needed to be equipped with a gas well completion. Within the new completions a permanent packer and a subsurface safety valve are installed on both wells. The welded completions will be hung-off in tension on the tension head. Well ZWD-A1A is equipped with a long tailpipe that extends to the bottom of the cavern. The working program covered the major working steps to be performed for the installation of the completion in the wells ZWD-A1A and ZWD-A1B.