[outinyellowdogcountry]

On the SCOTUS ballroom, how can they make three underground stories in the swampy DC soil? Very curious what kind of engineering would make that possible without leaking and without oxidizing.

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Morning America	God Bless America	God Bless America	West Virginia
Good Morning	God Bless America	Morning USA	Bless America
	Good Morning

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how can they make three underground stories in the swampy DC soil?

Ran it.

White House ballroom

Here’s how three underground stories are feasible in DC’s swampy, high-water-table soil (soft river deposits + clay), without leaks or corrosion:

● Slurry/diaphragm walls: Continuous reinforced concrete panels poured into deep trenches filled with bentonite slurry → creates a watertight “bathtub” cutoff wall keyed into deeper firm layers.

● Top-down construction: Build walls and floor slabs from the top down while excavating below → stabilizes soft soil, controls groundwater, minimizes settlement.

● Active dewatering + drainage: Temporary well-points/pumps during dig + permanent perimeter drains + sump systems keep water out long-term.

● Multi-layer waterproofing: Crystalline admixtures in concrete + external membranes + bentonite panels → zero seepage.

● Corrosion protection (“no oxidizing”): Epoxy-coated or stainless rebar, cathodic protection systems, non-metallic coatings → metals stay intact indefinitely.

All standard for deep basements in DC (and far deeper projects worldwide). The ground can handle it with the right sequence.