We have no explanation for the lack of objects at the bottom. we have dropped countless rocks, bullets, fireworks, and other stuff down there. Where did it go. Also, seems to me there were some strange albeit faint sounds down there. Our rig consisted of: a mini keychain spy camera, an LED flashlight, Styrofoam (for both padding and floatation, in case we hit water), a pencil (to protect the lens from rock strikes), fishing line, and a power drill (to reel the line back in)..