The red line does turn south a bit going west out of Gallery Place, but it doesn't go any further south than D street and doesn't go under any important federal buildings.
Besides, what would be the point? The National Mall is absolutely riddled with tunnels! West to east there's an old streetcar tunnel at 14th Street under the Bureau of Engraving, the 12th and 9th street road tunnels open to trucks, two tunnels apiece for the yellow/green and orange/blue lines with the latter going under dozens of federal buildings, the entire Smithsonian subway station, large underground art galleries south of the Smithsonian castle, the buried watercourses of Tiber Creek, the National Gallery gift shop & cafeteria under 4th street, the I-395 Center Leg Freeway that has the DOL built on top of it, the United States Capitol subway system, the old C Street streetcar tunnel under Senate Park, and the First Street heavy rail tunnel under the LOC / Supreme Court.
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I'm a DC native and that story is bullshit.
The red line does turn south a bit going west out of Gallery Place, but it doesn't go any further south than D street and doesn't go under any important federal buildings.
Besides, what would be the point? The National Mall is absolutely riddled with tunnels! West to east there's an old streetcar tunnel at 14th Street under the Bureau of Engraving, the 12th and 9th street road tunnels open to trucks, two tunnels apiece for the yellow/green and orange/blue lines with the latter going under dozens of federal buildings, the entire Smithsonian subway station, large underground art galleries south of the Smithsonian castle, the buried watercourses of Tiber Creek, the National Gallery gift shop & cafeteria under 4th street, the I-395 Center Leg Freeway that has the DOL built on top of it, the United States Capitol subway system, the old C Street streetcar tunnel under Senate Park, and the First Street heavy rail tunnel under the LOC / Supreme Court.