The surfaces of the walls and ceiling look like shotcrete. Render images can be found here: https://www.estunlar.fo/fo/um-tunlarnar/eysturoyartunnilin/ https:/

The surfaces of the walls and ceiling look like shotcrete. Render images can be found here: https://www.estunlar.fo/fo/um-tunlarnar/eysturoyartunnilin/ https://www.estunlar.fo/fo/um-tunlarnar/eysturoyartunnilin/