[Diapason]

"[...] the two deepest pits in the contiguous United States: Fantastic (586 feet) and Incredible (440 feet).[2] These two pits lie on opposite sides of the cave. Nearby and parallel to Fantastic are Smokey I (500 feet), Smokey II (262 feet)[...]"

That's the most confusing statement either. "A and B are the two deepest, with C nearby (being deeper than B)"

[cmpalmer52]

It is poorly written. I assume it’s because Fantastic and Incredible are “unobstructed, free fall pits” and Smokey I is partially obstructed or not a clear vertical drop in some way.