120 Days Building an Underground Two-Story House with Gym and Swimming Pool

Pushing the boundaries of primitive building, constructing a multi-level subterranean villa represents the pinnacle of wilderness engineering and physical dedication. Over a rigorous 120-day build cycle, primitive craftsmen transform raw soil, stone, and bamboo into a stunning two-story underground house complete with a workout gym room, decorative living quarters, and a subterranean swimming pool. This epic build highlights how basic hand tools and raw materials can create luxury off-grid living spaces.

Building beneath the earth’s surface on a multi-level scale requires precise structural calculations to handle immense overhead soil load and prevent catastrophic cave-ins. Master builders must manage floor excavation depth, benching wall slopes, setting heavy vertical support columns, and constructing watertight subterranean pools. In this detailed article, we break down the engineering mechanics, waterproofing methods, physical gym design, and essential tools required to craft a two-story underground compound.

Key Survival Takeaways

• Multi-tiered structural excavation: Carving tiered bench levels creates distinct floor elevations while preserving wall stability.
• Load-bearing earth columns: Retaining original soil pillars reinforced with hardwood timbers supports massive ceiling weight.
• Subterranean gym ergonomics: Carving earthen exercise benches and weight racks creates functional fitness spaces underground.
• Mortar plaster composition: Blending river sand, clay, and wood ash produces a durable, water-resistant interior wall coating.
• Stack-effect microclimate control: Vertical ventilation chimneys continuously flush humid air out while drawing in fresh air.
• Integrated aquatic sumps: Designing sloped pool drainage directs overflow water safely away from living and workout quarters.

Engineering Multi-Level Underground Architecture

Designing a two-story underground structure presents complex architectural challenges compared to single-level shelters. Excavating down over fifteen feet requires a stepped, multi-stage digging strategy. Builders begin by excavating the outer upper story perimeter before sinking a central pit for the lower level. Leaving integrated soil steps creates natural staircases connecting the two floors while serving as structural buttresses for outer soil walls.

To support the massive weight of soil placed back over the ceiling, builders install heavy hardwood load-bearing posts anchored into stone footings. Cross-timber joists are notched securely into the post heads, creating a rigid structural skeleton. Layering dense bamboo stalks over these joists forms a tight matrix that supports woven palm mats, waterproof clay layers, and several feet of topsoil backfill.

Detailed attention is also given to perimeter drainage. Before backfilling ceiling beams, builders cut lateral runoff channels packed with coarse gravel along the outer roof edges. This prevents rainwater from accumulating on top of the earthen ceiling, ensuring that hydrostatic pressure does not compromise the overhead roof timbers.

Constructing the Fitness Gym Room and Subterranean Swimming Pool

A unique feature of this 120-day build is the dedicated underground fitness gym room. Earthen workout benches, pull-up bars mounted into solid timber posts, and custom clay-molded weights allow builders to maintain physical conditioning while living off-grid. Wall alcoves carved directly into the soil hold torches and oil lamps, providing ambient warm lighting throughout the workout space.

Located on the lower story, the private swimming pool serves as both a cooling bath and an emergency water storage reservoir. Workers excavate the pool basin deep into solid clay soil, smoothing the floor and carving curved seating steps. Multiple coats of fine-filtered clay slurry mixed with natural tree sap binders are hand-rubbed onto the walls. Polishing the basin creates a sleek, watertight seal that prevents water seepage into surrounding subterranean rooms.

Furthermore, fitting the pool with gravity-fed inlet pipes connected to nearby clean stream sources ensures continuous fresh water replacement without relying on mechanical water pumps.

Subterranean Illumination, Air Quality, and Long-Term Maintenance

Living two levels underground requires efficient strategies for light distribution and air turnover. Sunlight shafts are carved at angled slopes through the ceiling turf, fitted with clear glass panes or polished reflective mirrors to funnel natural daylight deep into lower rooms. This reduces reliance on open flame torches, preserving oxygen levels indoors.

Air quality is maintained by installing twin vertical bamboo chimneys extending above ground level. Natural convective heat rising from lamps and human bodies draws fresh air down through the entryway, creating constant air circulation. Regular inspections of ceiling joists and periodic re-troweling of clay plaster ensure the compound remains safe and comfortable for years of off-grid living.

Gear & Equipment

Tactical Entrenching Shovel: Versatile compact shovel for fine-detail dirt carving and tight-space underground digging.

Rechargeable LED Headlamp: High-lumen hands-free illumination essential for working safely inside deep subterranean tunnels.

Heavy Duty Canvas Bucket: Reinforced hauling bag for transporting heavy rocks, soil, and clay out of deep excavation pits.

Wood Carving Chisel Set: Precision chisels for mortising heavy timber joinery and carving wood support notches.

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Conclusion

Executing a 120-day two-story underground build with a gym and pool represents an incredible triumph of primitive craftsmanship. This project proves that with patience, physical grit, and sound structural principles, building comfortable subterranean homes without heavy machinery is entirely possible.