Underground courtyard staircase design

Quick answer：

Underground courtyard staircase design refers to the architectural design of staircases leading to or within a courtyard that is situated below ground level. Such designs often prioritize accessibility, aesthetics, and structural integrity. They may include features like lighting, ventilation, and materials suitable for underground environments. The design must consider the space constraints, soil conditions, and the need for waterproofing to ensure the staircase's functionality and safety.