Tunnel Mountain is the nine-hole companion course to the Stanley Thompson eighteen at Fairmont Banff Springs, designed by Geoffrey Cornish with assistance from Robinson and opened in 1989. The course was added to accommodate growing demand at the resort and to provide a shorter option for guests seeking a quicker round in the dramatic Banff National Park setting. Cornish, a prolific Canadian architect known for his work across the northeastern United States and Canada, created a layout that works within the mountainous terrain while remaining more accessible than the resort's championship course. The nine holes play across rolling terrain with elevation changes that reflect the Rocky Mountain environment, though the routing occupies a more compact footprint than the Thompson course. Views of the surrounding peaks and forested landscape provide the natural backdrop common to golf in this part of the Canadian Rockies. The course serves primarily as a recreational option for resort guests and offers a less demanding test than the main eighteen holes, making it suitable for players of varying abilities or those with limited time. Tunnel Mountain operates as part of the broader Fairmont Banff Springs golf experience, sharing the historic resort's amenities and mountain lodge atmosphere. The course typically opens later in the spring and closes earlier in the fall than lower-elevation courses due to Banff's alpine climate and shorter growing season.