No real fear, but I learned a lot about myself. I was doing a "blackwater" dive at a local campground for the Police to search for suspected murder weapons. I had never been in those conditions before and it was a bit unnerving. After 6 feet, it was totally black. Even lights didn’t penetrate more than 2 inches. There was no difference between diving with eyes open or shut, literally. During the dive, I ended up getting entangled about 20 feet down in the anchoring system of a fountain that was in the middle of the pond. The only reason I know what it was is because I could hear the fountain above me as it had an electric pump to spray the water. I tried just about everything I could to back out of the entanglement, but couldn’t get free. (Since it was blackwater, there were no buddies on these dives, just surface support, so I coudlnd’t even signal for help) I tried for close to 5 minutes, is my guess. Finally, I reached for my knife to cut whatever I could to get free. I had no idea if it was going to be a power cord or just an anchoring line, but at that moment in time, I didn’t care. Somehow, someway, as I twisted to pull my knife, whatever had entangled me, let go and I floated backwards. I surfaced, moved away from the fountain and kept on with my search. Although I didn’t ever get scared, it taught me a lot about myself as a diver in certain circumstances. I’m just glad I had the training I did and made sure to keep a calm head.