sophisticated, Highly advanced and complex, hazardous, Involving serious potential danger, demanding, Requiring considerable effort, gruelling, Extremely tiring and exhausting, essential, Absolutely necessary, remote, Far from populated areas, enormous, Exceptionally large in size, compact, Small but efficiently arranged, massive, Extremely large and heavy, narrow, Limited in width, reinforced, Strengthened for additional protection, weather-beaten, Damaged by prolonged exposure to weather conditions, ageing, Becoming old and less efficient, state-of-the-art, Using the latest technology, outdated, No longer modern or effective, rust-covered, Covered in rust, newly-installed, Recently fitted or put in place, cylindrical, Having a circular cross-section, steel-framed, Built around a steel structure, corrosion-resistant, Resistant to chemical deterioration, high-pressure, Operating under considerable pressure, watertight, Preventing water from entering, heavy-duty, Designed for intensive use

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