I also recommend GDI.
Here's a link to my repont on cavern/intro to cave training with Rick of GDI.
http://www.scubaboard.com/showthread.php?t=169329
Jeff
Here's a link to my repont on cavern/intro to cave training with Rick of GDI.
http://www.scubaboard.com/showthread.php?t=169329
Jeff