Observed arrival · 2026-09-26
A Hole to China, With Coordinates
Through Earth lets you choose a spot on a globe and see where a straight tunnel through the planet would emerge.
○Open
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✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Curious learners exploring Earth and antipodes
- Worth noticing
- The page puts the 12.3 km Kola Superdeep Borehole beside an Earth diameter of 12,742 km: about 0.1% of the way through.
Field notes
Visitors can select a starting point with the globe or the optional location control; the page then presents the opposite-side destination and a cross-section through the planet’s layers. Its physics explanation distinguishes a classic 42-minute estimate from an approximately 38-minute estimate that accounts for the dense iron core, while noting that both omit air and heat. The page credits Natural Earth, NASA Blue Marble, and the PREM model.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue