Vimal,
Because you are asking about cost, I would also like to inform you that along with cost of instructions, there is RECOMMENDED and REQUIRED equipment that you need. That will be another added expensive.G
Yes, I saw the list of required and recommended equipment. Unfortunately, I started with PADI and a 'cattle' herd class. Didn't learn much in that class except to know how it feels to breathe underwater. I also wish GUE becomes more easily accessible although I guess the cost would be a barrier for newbies I will spend my money in upgrading my equipment..
Vimal, You might find this download of "DIR III" useful to help understand the equipment config. It was passed to me when I first showed interest in the path. The footage at the end is very inspiring .
www.gladiusinv.com/dir3.wmv