Shadowing Practice: Scuba Diving Risks - Decompression Sickness - Learn English Speaking with Video

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Decompression sickness occurred for the first time when workers surfaced from their pressurised workspace,

the casson, without step -by -step pressure equalisation.

The sickness can be caused by several different factors, including the dive time, the depth, and the surfacing method.

Decompression sickness can be caused by diving too long or by surfacing too quickly, unless Yes, several life -saving rules are observed.

With increasing ambient pressure, the nitrogen contained in the air you breathe dissolves in your blood.

In order to keep the nitrogen dissolved when resurfacing, when the ambient pressure decreases, it's vital not to ascend too quickly.

This is why it's very important to achieve a controlled ascent of not more than 10 metres per minute.

If the pressure decreases too quickly, nitrogen bubbles form in blood and body tissue as not enough can be breathed out.

The bubbles in the blood are similar to champagne bubbles that form after you open the bottle.

This is also a pressure drop.

Even with light decompression sickness, the bubbles can cause itching skin.

In fact, this

This is usually the first sign of decompression sickness.

These creeps can also be the starting signs of a serious illness.

Obese divers may feel stomach pains because the nitrogen is carried off more slowly from fatty tissue,

which has less effective blood circulation than muscle tissue.

This is why fat is considered slow tissue.

Heart and skeletal muscles are examples of fast tissues.

Sometimes a diver will suffer from the bends.

These manifest themselves in the form of aching muscles,

joints and bones and are caused by nitrogen bubbles gathering in the afflicted areas.

Temporary paralysis can occur.

The casualty may feel such strong pain that he writhes in agony.

If the bubbles form in the brain, or in the central nervous system, certain nerves may become paralysed or even paraplegia can occur.

In the brain, the bubbles can cause hallucinations or blindness, and sometimes they lead to death.

If decompression times are disregarded, gas bubbles can form in the bloodstream.

If bubbles gather in the lung, they can cause acute respiratory depression,

coughing and anxiety and possibly also cardiac arrest.

Gas bubbles cutting off the coronary arteries can also lead to a heart attack.

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Vocabulary and speaking notes for this lesson

This speaking lesson is built on the video “Scuba Diving Risks - Decompression Sickness”. The speaker keeps coming back to these words: bubbles, decompression, nitrogen, sickness, tissue. This video has 29 sentences and 372 words to shadow. The speech runs for 2:58. The speaker talks at a steady 125 words per minute, a comfortable pace for shadowing. Only 72% of the words are among the 3,000 most common in English, so the vocabulary is demanding.

Key vocabulary in this video

15 words from the video worth learning, with pronunciation and meaning:

Word	Pronunciation	Meaning
bubble noun	/ˈbʌbəl/	A spherically contained volume of air or other gas in a liquid, commonly a soapy liquid.
tissue noun	/ˈtɪʃ.(j)u/	Thin, woven, gauzelike fabric.
sickness noun	/ˈsɪknɪs/	The quality or state of being sick or diseased; illness; an illness.
nitrogen noun	/ˈnaɪ.tɹə.d͡ʒən/	The chemical element (symbol N) with an atomic number of 7 and atomic weight of 14.0067. It is a colorless and odorless gas.
occur verb	/əˈkɜː/	To happen or take place.
muscle noun	/ˈmʌs.əl/	A contractile form of tissue which animals use to effect movement.
breathe verb	/bɹiːð/	To draw air into (inhale), and expel air from (exhale), the lungs in order to extract oxygen and excrete waste gases.
gather verb	/ˈɡæðɚ/	To collect normally separate things.
decrease verb	/dɪˈkɹiːs/	Of a quantity, to become smaller.
dive verb	/daɪv/	To swim under water.
ambient adjective	/ˈæm.bi.ənt/	Encompassing on all sides; surrounding; encircling; enveloping.
temporary adjective	/ˈtɛmp(əˌɹ)ɛɹi/	Not permanent; existing only for a period or periods of time.
bone noun	/boʊn/	A composite material consisting largely of calcium phosphate and collagen and making up the skeleton of most vertebrates.
anxiety noun	/æŋˈzaɪ.əti/	An unpleasant state of mental uneasiness, nervousness, apprehension and obsession or concern about some uncertain event.
suffer verb	/ˈsʌfɚ/	To undergo hardship.

Phrasal verbs you will hear

Word	Pronunciation	Meaning
carry off verb		To transport away.
cut off verb	/ˌkʌt ˈɔf/ [ˌkɐɾ ˈɔf]	To remove by cutting.

Pronunciation to watch

The “th” sounds: breathe /bɹiːð/, gather /ˈɡæðɚ/, writhe /ɹaɪð/
The “sh” and “zh” sounds: tissue /ˈtɪʃ.(j)u/, circulation /ˌsɝkjʊˈleɪʃən/, champagne /ʃæmˈpeɪn/, casualty /ˈkæʒu.əlti/, decompression /ˌdiːkəmˈpɹɛʃən/
Long words — get the stress right: temporary /ˈtɛmp(əˌɹ)ɛɹi/, anxiety /æŋˈzaɪ.əti/, circulation /ˌsɝkjʊˈleɪʃən/, respiratory /ɹɪˈspɪ.ɹət.ə.ɹi/, casualty /ˈkæʒu.əlti/

How to practise with this video

Listen to the whole video once without speaking and note the words you do not know.
Shadow it sentence by sentence at normal speed, repeating each one until your rhythm matches the speaker.
Record yourself and compare with the original, paying attention to words like bubble, tissue, sickness.

What is the Shadowing Technique?

Shadowing is a science-backed language learning technique originally developed for professional interpreter training and popularized by polyglot Dr. Alexander Arguelles. The method is simple but powerful: you listen to native English audio and immediately repeat it out loud — like a shadow following the speaker with just a 1–2 second delay. Unlike passive listening or grammar drills, shadowing forces your brain and mouth muscles to simultaneously process and reproduce real speech patterns. Research shows it significantly improves pronunciation accuracy, intonation, rhythm, connected speech, listening comprehension, and speaking fluency — making it one of the most effective methods for IELTS Speaking preparation and real-world English communication.

Shadowing technique: read the full step-by-step guide →

Shadowing Practice: Scuba Diving Risks - Decompression Sickness - Learn English Speaking with Video

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