Exams / HS&E TUNN / Work in compressed air / Question 3
HS&E TUNN practice question: Work in compressed air (3 of 6) E. Specialist: Tunnelling A free question from our original HS&E TUNN practice exam. Try it, then open the answer to see why each option is right or wrong.
Last verified October 2026 against HSE guidance and the law ·How we write our questions
Workers are coming out of a compressed air working chamber at the end of a shift.
What do the rules now require during decompression?
Choose one answer.
A A. Holding your breathB B. Smoking to calm the nervesC C. Breathing oxygenD D. Coming out as fast as possibleShow the answer and explanation Answer: C
A. Wrong: Wrong. That could cause serious injury.B. Wrong: Wrong. Smoking has no place in decompression.C. Right: Right. HSE says oxygen breathing during decompression has been required since 2001.D. Wrong: Wrong. Decompression follows approved procedures.Explanation Decompression from compressed air work uses oxygen breathing, a rule since 2001.
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