“The Moffat Tunnel is a cathedral to engineering. Its simplicity occludes its sophistication, with the creation of nothing from something—the deliberate absence of rock amid incalculable weight. The finalized engineering marvel has a ventilation system that performs a complete air exchange within the tunnel in 18 minutes. The seemingly endless stone archway has intricately designed and perfectly positioned “umbrellas” to disperse alpine lake seepage to either side of the tracks. During construction, on February 15, 1925, tunneling progress stalled 1,100 feet directly under Crater Lake as 1,800 gallons per minute of water began flowing into the tunnel. At the suggestion of electrician K.S. Weston, crews ventured to the lake, cut through three feet of ice, and poured in 10 pounds of chloride of lime. Shortly thereafter, the presence of lime was detected inside of the tunnel. In an attempt to close the seam, a stick of dynamite was tossed into the lake, and the flow rate dropped drastically to 150 gallons per minute and then slowed to a trickle. Multiple times per day, the visceral vibration of mechanical thunder reverberates through the bowels of the earth.”