Saudi Arabia's Impossible Tower...

Scientific concepts, discoveries, and nature/physics phenomena mentioned

Atmospheric layering and climate variation with altitude

• A ~2 km-tall tower would pass through different climate/atmospheric conditions and could cross the planetary boundary layer (the region where surface-driven weather forms).
• The tower could encounter cloud formation and potentially pierce through clouds regularly.

Wind loading and structural dynamic response

• Wind forces increase with height; extremely tall buildings must avoid excessive swaying and fatigue.
• Tall buildings are not rigid and must manage oscillations to prevent structural stress buildup.

Sway mitigation using tuned mass dampers (TMDs)

• The design includes a tuned mass damper, described as a large pendulum near the top that swings opposite the building’s motion to reduce sway.
• Taipei 101 is cited as already using a similar concept (a large steel sphere mass).

Foundation mechanics and geotechnical stability

• A deep foundation is needed: a large reinforced concrete mat anchored to bedrock with deep piles.
• Continuous concrete placement is emphasized to prevent weak planes.
• Even small differential settling could cause the entire structure to tilt.

Materials science / high-performance engineering materials

• Use of ultra-high-performance concrete (higher compressive strength than regular concrete).
• Use of aerospace-grade steel alloys intended to resist extreme stress and fatigue under repeated wind loading.

Thermal/moisture effects: ice accretion on structures

• At certain temperatures/altitudes, cloud moisture can freeze on the exterior.
• Ice accumulation increases mass and can create aerodynamic problems.
• Risks include large ice slabs breaking loose and falling.

Renewable energy performance at altitude (solar, wind)

• Solar panels at ~2 km are claimed to sit above much atmospheric haze, potentially improving efficiency.
• Wind turbines at high altitude are described as benefiting from stronger/more consistent winds, while adding vibration/noise and maintenance challenges.

Hydraulics: high-pressure water distribution

• Pumping water far above ~100 m requires pressures exceeding typical pipe capabilities.
• The text estimates very large hydrostatic pressure at the base of a 2 km water column, implying a need for specialized high-pressure piping.

Atmospheric pressure and human comfort in elevators

• At 2 km altitude, air pressure is lower; rapid ascent could cause ear/physiological issues.
• Proposed mitigation: pressurized elevator cars maintaining near sea-level pressure and gradual adjustment.

Fire safety in extreme verticality

Standard fire suppression and evacuation assumptions fail at ~2 km height because:

• Firefighting equipment cannot reach all floors due to distance/pressure limits.
• Stair evacuation becomes impractically long for most people.

Proposed approach:

• Segmentation of the building into compartments plus
  • Pressurized refuge floors with independent air/water/communications
  • Fire-protected refuge logistics via specialized elevators

Psychology/behavioral effects of high-rise living

• Studies are cited suggesting higher anxiety/isolation for people living above ~30 floors.

---

Outline of any methodology / design strategy described

How the tower is proposed to reduce wind sway

• Install a tuned mass damper near the top.
• The mass swings opposite the building’s motion to counteract oscillations.

How the tower is proposed to handle ice accumulation

• Either:
  • Continuously heat the exterior glass to prevent ice buildup, or
  • Use an ice-resistant facade design.

How the tower is proposed to supply water at extreme height

• Put pumping stations every ~50 floors.
• Use redundant booster pumps for reliability and failure takeover.
• Use specialized high-pressure piping (industrial-grade, not typical building plumbing).

How vertical transport is proposed to work at 2 km height

• Use a hybrid elevator system:
  • Lower floors: cable elevators using ultra-strong carbon fiber cables
  • Upper floors: magnetic levitation (maglev-style) elevators
• Use sky lobbies (transfer points) so express elevators skip intermediate floors.
• Pressurize elevators to mitigate effects of lower ambient pressure during ascent.

How fire and evacuation are proposed to work

• Divide the building into independent segments.
• Each segment has:
  • Independent ventilation
  • Fire suppression systems
  • Pressurized refuge floors (air supply, water, communications)
• If needed, seal off a segment so a fire affects only a limited region.
• Evacuation includes fire lifeboat elevators operating during emergencies.
• Detection and suppression aim to:
  • Identify fires within seconds
  • Deploy automated suppression systems immediately

---

Researchers or sources featured (named)

• Alex Honnold (mentioned in relation to climbing Taipei 101)