If you are looking for a nice powerpoint to introduce caving to the scouts, maybe the attached will help. I do not know the author, but this one is very good:

introduction_to_basic_caving.ppt 

Here is a guide to caving LNT:  lntcaving.pdf

There are quite a number of caving opportunities in the northeast. One on the list to get to is Eagle Cave, the largest wild cave in the Adirondacks. The local high adventure base sponsors excursions there:

 http://www.wpcbsa.org/SummitBase/Activities/AreaActivities.asp

The most noted cave in the region is Clarksville Cave, just outside of Albany, NY (pic above): http://www.necaveconservancy.org/preserves/clarksville_preserve.php 

A couple years ago the troop we were with hooked up with The Boston Grotto (www.bostongrotto.org/) and organized a trip for the boys here.

Be sure to check the Guide to Safe Scouting before this type of trip.

http://www.scouting.org/pubs/gss/gss09.html