Two views of the Kilsby Tunnel are interesting; in the first "a working shaft," the powerful light bursting through the aperture in the roof, and shewing the group of workmen and horses with one of the operators descending, affords a striking idea of the vastness of the Tunnel itself. "the visibleness of the ray of light from the shaft," says Mr. Britton, "is occasioned by the opaqueness and humidity of the atmosphere, arising from the want of the ventilator." In a 2008 article Mike McKiernan commented this same picture: