| underground | unterirdisch |
| underground accident | U-Bahn-Unglück |
| underground aerial | Bodenantenne |
| underground air-raid shelter | Luftschutzkeller |
| underground amplifier | Unterflurverstärker |
| underground antenna | Bodenantenne |
| Underground Blues. A Station Play | Untertagblues. Ein Stationendrama |
| underground cable | Erdkabel |
| underground cable construction | Kabelleitungstiefbau |
| underground car park | Tiefgarage |
| underground carpark | Tiefgarage |
| underground carriage | U-Bahn-Wagen |
| Underground city | Untergrundstadt |
| Underground comix | Underground Comix |
| underground construction | Tiefbau |
| underground construction engineering | Bauwesen |
| underground container | Unterflurbehälter |
| underground corrosion | Erdbodenkorrosion |
| Underground culture | Underground |
| underground depot | Untertagedeponie |
| underground diaphragm | Schlitzwand |
| underground disaster | U-Bahn-Katastrophe |
| underground economy | Schattenwirtschaft |
| underground engineering | Tiefbau |
| underground entrance | U-Bahn-Eingang |
| underground escalator | U-Bahn-Fahrtreppe |
| underground exit | U-Bahn-Ausgang |
| Underground film | Undergroundfilm |
| underground flow subsurface run-off | unterirdischer Abfluss |
| underground furnace | Unterflurofen |
| underground garage | Tiefgarage |
| underground gasification | Untertagevergasung |
| underground glory hole mining | Trichterbau unter Tage |
| underground glory-hole mining | Trichterbau unter Tage |
| underground hazardous waste disposal facility | Untertagedeponie |
| underground heat | Erdwärme |
| underground hose bib | Unterflurhydrant |
| underground hydrant | Unterflurhydrant |
| underground infrastructure | unterirdische Infrastruktur |
| underground leaching | Untertagelaugung |
| underground level | Keller |
