Potential answers for "Part of an underground system"

⭐⭐⭐⭐ SEWER
⭐⭐⭐ TUBEMAP
⭐⭐⭐ METRO
⭐⭐⭐ MTA
⭐⭐ MUFFLER
⭐⭐ SENSOR
⭐⭐ GEARSHAFT

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