Dig a Tunnel Through Earth (Antipode Simulator)
Ever wondered where you would end up if you dug a hole straight through the center of the Earth? This tool calculates your exact antipode, displays dual entrance and exit maps, and models gravity train transit physics.
Dig a Tunnel Through Earth (Antipodal Core Tunnel)
Discover what is directly beneath your feet on the exact opposite side of the globe if you tunneled straight through the Earth's core.
How to use the tunnel through the Earth map
- 1Pick where you start digging
Search a place or click the map.
- 2Find the exit point
A straight tunnel through the Earth's center comes out at the antipode of your start.
- 3See the exit and travel time
View entry and exit maps, whether you would surface on land or in the ocean, and the gravity-train fall time.
What if you dug a hole through the Earth?
The concept of drilling straight through the Earth to emerge on the opposite side is one of the most enduring thought experiments in both classical physics and popular folklore. While map tunneling engines simulate the geographic exit coordinates—connecting any origin to its exact mathematical antipode—the actual journey through the planetary interior intersects profound geomechanical and thermodynamic frontiers.
If an imaginary tunnel were bored straight down through your feet, through the gravitational center of the Earth, and out to the surface on the other side, the diameter of the transit path measures exactly 12,742 kilometers (7,918 miles).
Simulating this journey provides a window into planetary structure, seismic wave propagation, gravitational acceleration under Newton's Shell Theorem, and the extreme limits of human geotechnical engineering.
Which layers would a tunnel pass through?
Earth is not a uniform solid rock sphere; it is a chemically and physically stratified heat engine divided into distinct concentric shells:
The Brittle Crust
Comprising less than 1% of planetary volume, the crust ranges from 5 km (under ocean basins) to 70 km (beneath the Himalayas). It consists of fractured basaltic and granitic rock where temperatures rise by approximately 25°C to 30°C for every kilometer of depth.
The Silicate Mantle
Extending to a depth of 2,890 km, the mantle contains 84% of Earth's total volume. Despite extreme temperatures reaching 3,000°C, immense hydrostatic pressure keeps the rock solid, though it creeps via slow convective currents over millions of years.
The Metallic Core
The outer core is a turbulent, churning sea of molten liquid iron and nickel at 4,000°C to 5,000°C, generating Earth's protective geomagnetic field. At the planetary center lies the solid inner core, a ball of crystalline iron under 3.6 million atmospheres of pressure.
How long would it take to fall through the Earth?
In classical Newtonian mechanics, an evacuated, frictionless tube through a planet of uniform density produces a theoretical transport mechanism known as a gravity train:
According to Newton's Shell Theorem, a falling passenger experiences gravitational attraction only from the spherical mass lying beneath their current radial distance from the center. The mass of the spherical shell above them exerts zero net gravitational force. Consequently, as you fall toward Earth's center, gravitational acceleration decreases linearly with radius: g(r) = g₀ × (r / R).
This linear restoring force obeys Hooke's Law, producing pure simple harmonic motion:
- Free-Fall Acceleration: You accelerate continuously downward from the surface, reaching a maximum terminal velocity of approximately 7,900 meters per second (28,400 km/h or 17,700 mph) as you shoot through the exact center of the planet.
- Zero Gravity at Center: At the precise center of Earth, gravity cancels out completely (g = 0), but your immense momentum carries you forward.
- Deceleration to Surface: As you climb out toward the antipode, gravity pulls backward, decelerating your capsule until it reaches zero velocity precisely as you reach the surface at your antipodal destination.
The fall-time calculation, step by step
The transit time for a frictionless fall through Earth depends on whether you model a uniform density or realistic density profile:
T_uniform = 2π · √(R / g₀) ≈ 84.3 min ⟹ t_transit = π · √(R / g₀) ≈ 42.2 min- Oscillation angular frequency ω = √(g₀ / R) = √(9.80665 / 6,371,008) = 0.0012407 rad/s
- Period T = 2π / ω = 2π / 0.0012407 = 5,064 seconds (84.4 minutes)
- Uniform transit time = T / 2 = 2,532 seconds = 42 minutes 12 seconds
- Realistic PREM density profile correction: Dense iron core keeps gravity near ~10 m/s² through mantle
- PREM integrated transit time = 2,291 seconds = 38 minutes 11 seconds
- Maximum center speed = 28,440 km/h (17,670 mph)
Under a realistic Earth density profile, a passenger falling into an evacuated tube reaches the other side of the planet in just 38 minutes and 11 seconds without using an engine.
Earth’s layers: depth, temperature and pressure
Review the geophysical characteristics of the rock and metal strata that any physical tunnel would have to penetrate:
Planetary Strata, Depths, Geothermal Temperatures, and Hydrostatic Pressures
Geophysical parameters based on the Preliminary Reference Earth Model (PREM).
| Planetary Layer | Depth Range | State of Matter | Temperature | Pressure | Density |
|---|---|---|---|---|---|
| Continental Crust | 0 – 35 km (up to 70 km) | Solid (Granitic / Basaltic) | Up to 500 °C | 0.1 – 1.0 GPa | 2.7 – 3.0 g/cm³ |
| Upper Mantle (Lithosphere/Asthenosphere) | 35 – 410 km | Ductile / Semi-solid Silicates | 500 – 1,000 °C | 1 – 14 GPa | 3.3 – 3.5 g/cm³ |
| Transition Zone | 410 – 660 km | High-pressure Olivine Minerals | 1,000 – 1,600 °C | 14 – 24 GPa | 3.5 – 4.0 g/cm³ |
| Lower Mantle (Mesosphere) | 660 – 2,890 km | Solid Perovskite / Bridgmanite | 1,600 – 3,000 °C | 24 – 136 GPa | 4.4 – 5.6 g/cm³ |
| Outer Core | 2,890 – 5,150 km | Liquid Iron-Nickel Alloy | 4,000 – 5,000 °C | 136 – 330 GPa | 9.9 – 12.2 g/cm³ |
| Inner Core (Center of Earth) | 5,150 – 6,371 km | Solid Crystalline Iron-Nickel | 5,000 – 5,500 °C | 330 – 364 GPa | 12.8 – 13.1 g/cm³ |
Why no one can actually dig through the Earth
While digging a tunnel through the Earth is an illuminating mathematical exercise, it is physically impossible under known material sciences:
- The Kola Superdeep Borehole (SG-3): The deepest artificial hole ever drilled into Earth's crust is the Kola Superdeep Borehole in Russia. Reaching a final vertical depth of 12,262 meters (40,230 ft or 7.6 miles) in 1989, drilling had to be permanently abandoned when temperatures reached 180°C (far higher than predicted), turning rock into a plastic-like sludge that deformed and sealed drill bits.
- Fraction of Total Depth: The Kola borehole penetrated only 0.2% of the distance to the Earth's center. Human civilization has never breached even the base of the continental crust.
- Thermodynamic and Pressure Barriers: No known alloy, composite, or diamond matrix can maintain structural integrity against pressures exceeding 300 Gigapascals (equivalent to holding the weight of a mountain on a postage stamp) or survive temperatures exceeding 5,000°C without vaporizing.
- Tunneling through the planet is a theoretical physics gedankenexperiment; no physical drilling technology can withstand mantle pressures or core temperatures.
- Coriolis deflection causes any falling object in a vertical polar or equatorial shaft to collide with the tunnel walls unless guided along a curved trajectory.
Related Planetary & Antipodal Geodetic Tools
Trace exit points, evaluate horizon curves, and inspect global coordinates:
Quick facts about the tunnel through the Earth map
| Fact | Value | Notes |
|---|---|---|
| Tunnel Length | 12,742 km (7,918 mi) | Mean diameter of spherical Earth |
| Gravity Train Duration | 42.2 Minutes | Theoretical free-fall transit time through core |
| Ocean Exit Rate | ~85% of Land Exits | Most terrestrial points exit into open ocean |
Edge cases and exceptions
Land-to-Land Antipodes Are Rare
Because oceans cover over 70% of Earth, most antipodes of continental landmasses land in water. Famous exceptions include Spain (which tunnels to New Zealand) and parts of Chile/Argentina (which tunnel to China/Mongolia).
The tunnel through the Earth map: worked examples
Madrid to New Zealand Tunnel
Scenario: Tunneling straight through from Madrid, Spain.
Outcome: Exits in the South Pacific Ocean just off the east coast of New Zealand's North Island.
Frequently asked questions about the tunnel through the Earth map
If I dig a hole through Earth from the USA, will I come out in China?
No. Tunneling from anywhere in the contiguous United States exits in the southern Indian Ocean between Australia and Antarctica.
What is a gravity train?
A theoretical frictionless transport system through a planetary tunnel where an object falls under gravity, accelerates to the center, and coasts to the other side in approximately 42 minutes.
How long would a trip through the Earth take?
Ignoring air resistance and friction, a fall through a tunnel to the antipode takes about 42 minutes, assuming uniform density.
How deep would the tunnel be?
About 12,742 km (7,918 miles) through the center, the Earth's diameter.
How hot is it inside the Earth?
The inner core is about 5,200 °C, roughly as hot as the surface of the Sun. No material could survive it.
Has anyone dug through the Earth?
No. The deepest borehole, the Kola Superdeep Borehole in Russia, reached about 12.26 km, less than 0.2 percent of the way.
What is Earth's mean density?
About 5.51 g/cm³. The real planet is much denser at the core, which changes the transit time slightly.
Where would I come out?
At your antipode. The result shows both the entry and exit maps and whether the exit is on land or water.
Does the Earth's rotation matter?
Yes. A real tunnel would be affected by the Coriolis force, which would push a falling object against the wall.
Would the tunnel from your location come out in the ocean?
Most likely. About 71 percent of Earth is water and only about 4 percent of land has land on the opposite side, so most exits are in an ocean. The result shows the exact exit and whether it is land or water.
Keep exploring
What to do with this result
- Antipode Finder — Exact Opposite Point on EarthUse this to find your antipode.
- Distance Between Two Places (Address to Address)Use this to measure the distance between two addresses.
- Random Location Generator (Equal-Area Sphere)Use this to generate a random location.
- Country Size Comparison (True Size of Landmasses)Use this to compare true country sizes.
- How Far Am I From the Equator?Use this to measure how far you are from the equator.