| Rating | Solver | Clue |
|---|---|---|
| ZERO | Rock bottom | |
| NADIR | Rock bottom | |
| BOTTOM | Of or pertaining to the bottom; fundamental; lowest; under; as, bottom rock; the bottom board of a wagon box; bottom prices. | |
| BUOY | A float; esp. a floating object moored to the bottom, to mark a channel or to point out the position of something beneath the water, as an anchor, shoal, rock, etc. |