I was detecting a park close to home that has a man-made beach (freshwater) where I have found a few good coins with my deep-seeking modified beach/jewelry program. This morning I hit a faint signal with VDIs varying widely from pos. to neg. This was a sure digger for me because almost all of these type signals turn out to be older coins. I dug to about 6 inches and still no signal with my Garrett pinpointer. I dug 2 inches deeper and my Propointer picked up the signal. Just a little further! I dug to the 8 1/2 to 9 inch level and there it was, an antique aluminum pulltab, circa 1960's. Needless to say, I was very excited and could barely contain the urge to scream with joy! Oh well, maybe next time.