| underground test | 23.17 | Banned all but underground nuclear tests. | ||
| underground group | 7.11 | Omar is believed to be a key member of the underground group. | ||
| underground water | 6.91 | In Mayan, that means underground water. | ||
| underground bunker | 6.32 | Their underground bunker is built over a year-round spring. | ||
| underground explosion | 6.25 | France has also backed a ban on all underground nuclear explosions. | ||
| underground tunnel | 5.00 | Bomb-sniffing dogs will patrol underground tunnels. | ||
| underground church | 4.81 | The underground churches reject government controls. | ||
| underground garage | 4.81 | He was ferried into an underground garage. | ||
| underground blast | 4.28 | After setting off three underground nuclear blasts, | ||
| underground network | 4.08 | No time could be wasted in this underground network. | ||
| underground shelter | 4.08 | Millions rushed to underground shelters. | ||
| underground movement | 3.49 | This is the only underground movement in China. | ||
| underground facility | 3.29 | Initial reports had said it was an underground facility. | ||
| underground economy | 3.16 | Some work in the underground economy. | ||
| underground pipe | 3.09 | The water was drained into underground pipes. | ||
| underground station | 2.63 | The closest Underground station is Holborn. | ||
| underground train | 2.57 | Or an underground train coming into a station. | ||
| underground storage | 2.44 | The facility also included underground storage tanks. | ||
| underground tank | 2.37 | Even an underground tank can float. | ||
| underground railway | 2.24 | Most people were obliged to take the Metro underground railway. |