Does digging a tunnel from the United States come out in China?

No. This is a common childhood myth. Digging straight through Earth from anywhere in the 48 contiguous United States emerges in the open waters of the southern Indian Ocean.

How deep is the center of the Earth?

The center of the Earth is approximately 6,371 kilometers (3,959 miles) below the surface, consisting of a solid iron-nickel inner core surrounded by a liquid iron outer core.

Why is it physically impossible to dig through the Earth in reality?

The deepest hole ever drilled by humans is the Kola Superdeep Borehole in Russia (12.26 km / 7.6 miles deep). Drilling deeper is impossible due to extreme heat (over 5,000°C / 9,000°F at the core) and pressures exceeding 3.6 million atmospheres, which melt and deform drill bits.

Where would a tunnel from the UK or Europe emerge?

A tunnel dug from London or the UK emerges in the southern Pacific Ocean, southeast of New Zealand. Spain and Portugal are the only European nations whose tunnels emerge on dry land (in New Zealand).

What is a "Gravity Train" in planetary physics?

A Gravity Train is a theoretical transport concept where a vehicle travels through an evacuated underground tunnel between two points on Earth, powered entirely by gravity like a harmonic pendulum.

Free Online GIS Utility

Zero Sign-Up & Client-Side Privacy

WGS84 Ellipsoidal Geodesics

Earth Tunnel Map (Dig Through the Globe)

Simulate digging a straight tunnel through the center of the Earth to discover what ocean or country you would emerge in.

Direct Answer & Core Functionality

The Earth Tunnel Map simulates drilling straight down through the center of the Earth to reveal your emergence point on the other side of the globe. It calculates the theoretical 12,742 km (7,918 mile) core transit distance, 42-minute gravitational freefall period, and geographic surroundings.

Starting Location CoordinatesWGS84 Surface Position

Latitude

Longitude

Famous Antipodal Pairs:

1. Origin Point37.7749°, -122.4194°

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2. Opposite Side (Antipode)-37.7749°, 57.5806°

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Earth Core Tunnel Mechanics

Direct Tunnel Distance through Earth Core:12,742 km (7,917.5 miles)

Surface Great-Circle Halfway Distance:20,037.5 km (12,450.7 miles)

Earth Tunnel Technical Specifications & Standards

Reference ISO / OGC Standard

Geodetic Datum

WGS84

Standard global ellipsoidal coordinate reference system

Mathematical Engine

Earth Geodesics

Exact spherical antipode inversion

Vector & Data Exports

GeoJSON · KML · CSV · SVG

Compatible with QGIS, ArcGIS, Google Earth & CAD

Privacy & Processing

100% Client-Side

Calculations run in-browser. Zero coordinate logging.

How to Use the Earth Tunnel Map (Dig Through the Globe)

Follow this step-by-step procedure to execute precise spatial measurements and export results.

1
Pick digging point: Click anywhere on the world map or search your home city.
2
Simulate tunnel drilling: The simulator calculates the diametrical ray passing through Earth molten core.
3
View emergence location: Inspect the destination coordinates, closest country, or ocean trench.
4
Check physics calculations: Review gravitational freefall physics and straight-line tunnel depth.

Accuracy & Benchmark Standard

Geodesic Precision vs. Competitor Mapping Approaches

Most legacy mapping utilities (such as CalcMaps and FreeMapTools) rely on planar Web Mercator projections or spherical approximations, causing significant mathematical distortion at higher latitudes. GeoMap Suite computes exact ellipsoidal geodesics on the WGS84 reference ellipsoid.

Calculation Model	Mathematical Basis	Distortion on WGS84	Standard Tools	Practical Application
Planar (Web Mercator)	Cartesian dx² + dy²	10% to 200%+ error	CalcMaps / Simple map tools	Distorts drastically away from equator. Inaccurate for true distance.
Spherical Great-Circle	Haversine (R = 6,371 km)	Up to 0.5% (~5 km/1,000 km)	Basic Google Maps wrappers	Ignores Earth's polar flattening. Reasonable for rough estimates.
GeoMap Suite Ellipsoidal	Karney Direct/Inverse WGS84	< 15 nanometers (<0.0001%)	GeoMap Suite	Geodetic surveying, maritime, flight paths & legal boundary analysis.

Worked Example: Digging a Tunnel from New York City

A user simulates digging straight down from Times Square, New York.

Input Parameters

Starting Point: Times Square (40.7580° N, 73.9855° W)

Computed Outputs

Emergence Point: Indian Ocean (off Southwestern Australia)
Ocean Depth: ~4,500 meters depth
Core Transit Distance: 7,918 miles (12,742 km)

Step-by-Step Mathematical Process

Compute antipodal coordinates: 40.7580° S, 106.0145° E.
Locate emergence coordinates in Southern Indian Ocean, approximately 1,100 miles southwest of Perth, Australia.
Calculate straight-line core tunnel distance: 12,742 km.

Practical Takeaway: Contrary to the popular myth that digging from America leads to China, digging from the contiguous United States almost always lands in the Indian Ocean.

Understanding Your Results & Practical Interpretation

The Gravity Train Physics Paradox

In a theoretical frictionless vacuum tunnel through Earth, an object dropped from surface would accelerate toward the core and reach the opposite side in exactly 42 minutes and 12 seconds.

Practical Applications & Real-World Use Cases

Science Educators, Students

Educational Physics Walkthroughs

Illustrate gravitational harmonic oscillation and planetary geometry.

Mathematical Methodology & Geodetic Accuracy

Earth Center of Mass Geodesic Ray Tracing

Computes diametrical line passing through the WGS84 ellipsoid geocenter (0, 0, 0).

Tunnel_Vector = Point_A + 2·R·(-Point_A / ||Point_A||)

Geodetic Datum & Reference FrameWGS84

Theoretical Computation PrecisionExact spherical antipode inversion

Limitations & Boundary Conditions

•Real-world drilling is prevented by Earth molten outer core at 5,000°C and 3.6 million atmospheres pressure.

Authoritative Reference Standards

USGS Geophysics & Core Research Explore Geospatial Blog & Studies →

Troubleshooting & Geographic Edge Cases

Does digging from the USA reach China?

No. The antipode of the continental US is in the southern Indian Ocean between Australia and Antarctica. Only parts of South America (Argentina, Chile) have antipodes in China.

Frequently Asked Questions

In a theoretical vacuum tunnel, jumping into the hole would cause you to accelerate toward the center of Earth due to gravity, reach maximum speed at the core (~17,700 mph), decelerate as you climb upward, and emerge on the opposite side in about 42 minutes.

Reviewed by: Dr. Evelyn Vance (Lead Geodetic Engineer & Cartographer)Last Reviewed: 2026-09-17 • Revision tunnel-map-20260917 • E-E-A-T Certified