{"type": "rich", "version": "1.0", "title": "Tunnel - Hafod-Morfa Copperworks", "description": "Investigations inbetween the Cast House and former Rolling Mill ((LB 16878) of the Hafod-Morfa Copperworks, Swansea revealed a very large stone built and brick-arched tunnel running underneath the rolling mill. Its function is unclear but may have been an underground tramroad or walkway. ", "url": "https://p3d.in/tVL2C", "author_name": "BMALTD", "provider_name": "p3d.in", "provider_url": "https://p3d.in", "thumbnail_url": "https://p3d.in/model_data/snapshot/tVL2C", "thumbnail_width": 512, "thumbnail_height": 512, "html": "<iframe src=\"https://p3d.in/e/tVL2C\" width=\"640\" height=\"480\" loading=\"lazy\" frameborder=\"0\" allowfullscreen></iframe>", "width": 640, "height": 480}