engineering

Underground Great Wall of China

Underground Great Wall of China is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Underground Great Wall of China rather than just read about it. In short: The Underground Great Wall of China (Chinese: 地下长城; pinyin: Dìxià Chángchéng) is the informal name for the 3,000 mile (5,000km) system of tunnels used by China to store and transport intercontinental ballistic missiles (ICBMs). Description Due to the great secrecy surrounding the tunnels, little information about them is publicly available.

Key takeaways

Underground Great Wall of China belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Underground Great Wall of China to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Underground Great Wall of China from memory before moving on to harder problems.

Reference excerpt

The Underground Great Wall of China (Chinese: 地下长城; pinyin: Dìxià Chángchéng) is the informal name for the 3,000 mile (5,000km) system of tunnels used by China to store and transport intercontinental ballistic missiles (ICBMs).

Description Due to the great secrecy surrounding the tunnels, little information about them is publicly available. The tunnels allow for mobile ICBMs to be shuttled around to different silos by truck and rail, and possibly stored in reinforced underground bunkers. This greatly enhances the ICBM's chance of survival in a direct nuclear strike, which enables their use in a second strike unlike ICBMs based in static nuclear silos which are susceptible to a direct nuclear attack. A 2011 report written by a Georgetown University team led by Phillip Karber conducted a three-year study mapping out China's complex tunnel system, which stretches 5,000 km (3,000 miles). The report determined that the size of the Chinese nuclear arsenal is understated and as many as 3,000 nuclear warheads may be stored in the tunnel network. This hypothetical maximum storage or basing capacity along with Karber's own misconceived suggestions on fissile material, resulted in Western media purporting that 3,000 warheads were actually in the facility. The Karber study went on to state that the tunnels are not likely to be breached by conventional or low-yield earth-penetrating nuclear weapons such as the B61-11.

See also 816 Nuclear Military Plant Underground Project 131 Iranian underground missile bases Underground Great Wall Great Wall of China Great Wall of Sand Great Green Wall of China

References

External links Strategic implications of China's Underground Great Wall, Karber 2011.Hosted by FAS.PDF

Worked examples

Example 1 — a first encounter with Underground Great Wall of China

Start with the simplest possible case. Write down what Underground Great Wall of China claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Underground Great Wall of China before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Underground Great Wall of China ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Underground Great Wall of China

In research: Underground Great Wall of China appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Underground Great Wall of China in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Underground Great Wall of China is common in secondary-school and first-year university syllabi. It links to neighbouring topics Military installations of China, Subterranean buildings and structures, so understanding it makes those chapters shorter.
In everyday life: Look for Underground Great Wall of China outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Underground Great Wall of China in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Underground Great Wall of China means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Underground Great Wall of China out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Underground Great Wall of China in simple terms?

Why does Underground Great Wall of China matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Underground Great Wall of China?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Underground Great Wall of China.