Fort Lytton is a place that has accommodated diverse physical and cultural changes, and evidence of this constant flux can be seen throughout the site. This design intervention responds to the nature of “growth over submerged objects” in the landscape. ‘Sub-Terrain’ uses a method of layering topography, and insertion of objects within those layers that will be partially or wholly submerged. The project will allow for age and natural processes to change the character and spatial form of the site. What is investigated in the project is the world that is revealed beneath the upper crust of the land. Beneath these layers there are grotto spaces, refuges and a constant growth, weathering of materials and land. The design facilitates growth, and aims to be a platform for a changing, dynamic environment. Water will be an unpredictable agent of change on site, and be allowed to come in and flood different layers and landscape objects. The water comes into the project with the tide, takes part of the site and over time reveals a new landscape.