We've got a lake out my way called Bullards Bar. The lake is has many very steep cliffs and can be very deep. This time of the year, when the water temp is in the mid- 40's, it's not unusual to catch bass in 75 feet of water.
A couple years ago a friend and I were fishing on his boat Bullards bar. He put a 2 ounce weight on his line and let it sink next to the transducer. We could actually see that the sinker drop to the bottom of the lake. We were sitting in about 80 feet of water time. The fish finder allowed us to see the sink or drop. As it hit the bottom we actually saw the fish rise rise from the bottom for an instant and then settle back down into the lake bottom. It was way cool.