The project is based on the first semester research on climate-related passive design. Consisting in a permanent storage “inserted” in the historical water reservoir of Hong Kong Bishop Hill, its underground quality can fulfil the requirements of climate-controlled storage (around 55.0 F and 70% humidity). This “natural” advantage is ideal for storing goods like artworks and historical documents. Air conditioners cannot, unless highly invasive and energy consuming, control the entire volume. That’s also the topic of the project: Construction in the Post-Technological World means finding new, alternative and better ways. Without high-tech, can we still achieve good conditions and help protect the history of our city? Tectonically, the project is an extension (digging underground) based on a historical site (hardware), embracing the potential of its Romanesque structure, arches, and columns. Functionally, it challenges the “Storage” (Software) itself, e.g. exploring how space can shift from storage to display quickly, turning it into an explorative time-machine.