| FOCUS | The name of the underground point where an earthquake begins |
| EPICENTER | Point on Earth's surface directly above the underground point where an earthquake begins |
| THEBOWERYKING | Name of the underground crime lord played by Laurence Fishburne in the film mentioned in 17a: 3 wds. |
| APOGEE | Point where an orbiting satellite is furthest from the earth (6) |
| HYPOCENTRE | The point within the earth where an earthquake originates (10) |
| EPICENTERPOEM | "This is the focal point / Above a seismic source / Where an earthquake proceeds / With devastating force," e.g.? |
| ROOMATTHETOP | Runner in part of The Underground and that man from the highest point of attic (4,2,3,3) |
| TURKESTAN | Asian region, the location of the Underground Mosque and the Mausoleum of Khoja Ahmed Yasawi (9) |
| ARROWROOT | One of those in the Marantaceae family in Dart and part of The Underground system (9) |
| INFERNAL | Figure out going up lane, most of what is characteristic of the underground (8) |
| TUNNEL | Sort of vision of the underground way (6) |
| ROUND | Like the Circle Line, it's part of the Underground (5) |
| BASEMENT | It is the story, we are told, of the underground (8) |
| ROOT | Origins of the underground part of a plant |
| LEVI | Abolitionist Coffin who was nicknamed the "President of the Underground Railroad" |
| NIAGARARIVER | Locale at the end of the Underground Railroad |
| ROOTAGE | A developed system of the underground parts of a plant (7) |
| OHIO | Midwestern state instrumental in the operations of the Underground Railroad |
| ROOTCANAL | One of the underground systems has a chamber for mouthy type facing the drill perhaps (4,5) |
| INNERTUBE | Area of the Underground bounded by the Circle Line that could be blown up? (5,4) |
