The video shows a close-up of a large, black, iron furnace or boiler with the inscription "ARSENAL S. TIAGO FUNCHAL" above its central access door. The central door is open, revealing the interior firebox with an assortment of long metal tools resting inside. Above the central door, there are two rectangular openings displaying a series of circular tubes, likely for heating water or other fluids. The lower doors are also open slightly. The background is partly red and there is a wheel and some straw or dried vegetation visible on the left side of the frame. The camera moves slightly closer to the object, focusing on the interior of the firebox and the tools.