The vent is 400 feet across. Awesome glow, especially considering that the surface of the molten pool is 650 feet below the edge you see here. So, if you were to float the Seattle Space Needle on the surface of the molten lake, the observation deck would still be 130 feet below the rim! The very tip top of the Space Needle (the aircraft warning light) would even still be 45 feet down! Not to mention that the folks in the restaurant would likely be quite uncomfortable, which may unfairly reduce any tips left for the service staff.