Installing kilometres of high-pressure stainless-steel piping inside a confined tunnel environment presents unique challenges. Conventional welding can introduce risks related to material integrity, hot-work safety and post-weld quality requirements. This case study explores how a non-welded cold-press piping solution was used for the Samruddhi Mahamarg Tunnel's high-pressure water mist network, helping address these challenges while improving installation efficiency and reducing total installed cost.