Tunnelling through a Mountain - Numberphile

TL;DR

Ancient Greeks used triangles to dig tunnels through mountains in 6th century BC.

Transcript

You join me today in ancient Greece. It's-

• (Well- this) (doesn't look like it. They've good lighting.) Thanks, it's it's not not what you were expecting but it's 6th century BC and in particular we're on a Greek island just off the coast of Turkey. It's called Samos and, I know what you're thinking, you'd like to dig a tunnel through a mountain,... Read More

Key Insights

• 🚵 Ancient Greeks in 525 BC on the island of Samos used triangles and precise measurements to dig a kilometer-long tunnel through a mountain.
• 💦 Water levels were used to ensure tunnel flatness during ancient Greek excavation processes.
• 🖕 The tunneling technique involved calculating steps, angles, and distances to meet perfectly in the middle.
• ❓ Garret Wheeler narrates the fascinating ancient Greek tunneling technique in engaging detail.
• ❓ Accuracy and precision were crucial in ancient Greek tunneling methods without modern equipment.
• 🤔 Brilliant.org sponsors the video, offering discounts on courses that encourage interactive learning and critical thinking.
• ❓ Polycrates, a historical figure, desired a tunnel on Samos in 525 BC.

Questions & Answers

Q: How did ancient Greeks ensure two tunneling teams met in the middle of a mountain?

Ancient Greeks used triangles and precise measurements to ensure two tunneling teams met in the middle by guaranteeing angles aligned perfectly with minimal deviation.

Q: What technique did ancient Greeks use to maintain a straight tunnel path through a mountain?

To maintain a straight tunnel path through a mountain, ancient Greeks carefully measured steps and angles as they circled the mountain, using triangles to guide their digging direction accurately.

Q: How did workers ensure the tunnel entrance and exit were at the same altitude?

Workers ensured the tunnel entrance and exit were at the same altitude before starting by aligning a line that runs exactly east to west and another running north to south using natural landmarks or compass-like tools.

Q: What role did water levels play in ancient Greek tunneling techniques?

Water levels were used to maintain flatness in the tunneling process, ensuring workers did not veer off course vertically and kept a consistent path through the mountain.

Summary & Key Takeaways

• In ancient Greece on the island of Samos, a tunnel was dug through a mountain in 525 BC using a clever technique involving triangles.

• By carefully measuring steps and angles, workers ensured the tunnel met perfectly in the middle, aided by maintaining water levels for accuracy.

• This ancient tunneling method showcases the ingenuity and precision of ancient engineers without access to modern tools.