Related Clues:
- Part of an alien abduction story, often
- Six feet under?
- Voyager 2, for one
- It equals six feet
- Question closely
- Data-collecting craft
- Delve
- Official investigation
- Nautical measure
- About 1.8 meters
- Senate investigation
- Penetrating investigation
- Measure of depth, to 56-Across
- Explore deeply
- Six feet of water