| WORMHOLE | Hypothetical tunnel in space-time (8) |
| WORMHOLES | Hypothetical tunnels in space between different parts of the universe (9) |
| FURTHEST | Most remote in space, time, etc (8) |
| MISTRIAL | Hearing one that is flawed in film version of The Tunnel in retrospect (8) |
| NARROWLY | Dart reaching end of tunnel in New York, just (8) |
| CATACOMB | Tunnel in Muscat? A combat division (8) |
| UNDERWAY | Tunnel in progress? |
| SHIPWORM | Mollusc making tunnels in submerged wood (8) |
| EARCANAL | Obscure information enters train tunnel in one's head (3,5) |
| TRAPDOOR | Name the spider that constructs silk-lined tunnels in the ground (8) |
| EVENT | Occurrence defined in physics, especially relativity, as a single point in space-time (5) |
| BY | Preposition expressing relation in space, time, direction or movement |
| BEYOND | Farther along in space, time or degree (6) |
| COMET | Body in space time to arrive first (5) |
| REMOTE | Far away in space, time (6) |
| UNIVERSE | The aggregate of energy, space, time and all existing matter (8) |
| EINSTEIN | Space-time guru |
| DVANDVA | Diameter over velocity plus volume over area in space-time, say |
| TIMEWARP | Tim with Egyptian leader's war paint; first space-time distortion (4,4) |
| EGODEATH | "Complete transcendence-beyond words, beyond space-time, beyond self," per "The Psychedelic Experience" |
