thansk guys, lots of good ideas here and my buddy did build a sub from a propane tank that i gave him. i just can't find the picture of it to post. but it would be no good for us because the exhaust and air intake is only so long.
i have been looking in to metal dectors and such. will keep you posted but i did add a list to the webpage on my website on what the PLAN is.
http://kingofobsolete.ca/sterling_SU...AT_WEBPAGE.htm
also we are finding out that there is lots of military stuff sunk in the northern lakes. most of it is planes.
thansk