Detector for rocky bottom swimming holes?

[CliffHanger]

In my neck-of-the-woods the bottom of the mountain rivers, creeks, streams and the deeper pools used as swimming holes are mostly rocks. From small rocks to boulders. I need to find away to get down between these rocks to the jewelry and other goodies that have been lost there.

Awhile back while browsing on the web I saw a photograph of a guy standing on a large rock on a creekbank. If I remember correctly he was holding a long rod and I am under the impression he was poking it among the rocks under water trying to locate whatever. I can't find that picture again. I can't remember if I was looking under metal detecting, water detecting or nugget shooting. Anyone have and idea as to what that pole, rod, stick, or probe thing is?
What is the best detector to get down between the rocks where the stuff is? Or, which detectors have the power to reach down through the rocks?

Thanks for your time

Cliffhanger

 

[alton]

Small jewelry like rings would continue to fall through the rocks we have in the streams here in East Tennessee. I have "the Brute" for a scoop, but it won't touch some of the river rocks in these streams.

I don't know about the detector, but my guess is use the smallest coil you can get on the detector you have.

 

[SurfCutter]

Cliffhanger
This is just from my limited experience and opinion so take it for what you will , but from the few rock beaches I have hunted both fresh and salt waters detection of the target was not the problem. Recovery was the hard part ,it came down to either using a small heavy metal scoop and getting goods at prying the rocks away with your feet if need be or diving / snorkeling and retrieving the targets by hand . There are a couple of beaches just outside of Montreal , that had a thin layer of sand over a rock ledge and many of the older targets would be wedged in the rocks on this ledge or in the cracks . Diving with a Hooker Rig was the best answer to this problem more than paid for the cost of the rig the first time out using it ..
Good Hunting
Bill G.