>Is listed as a skill on the info page but there is no
>helpfile for it
>and is not listed in the skills-list in game.
>
>I am guessing Caverndwellers were "overpowered" and it was
>removed?
>
>

http://www.carrionfields.net/helpsearch.php?id=1591

It's in the normal Ambush help file. Though dive may not be tagged as a help item.