No, this has nothing to do with terrorism. It has to do with archaeology or history. However, as a result of the discovery, the cave was closed last weekend and the explosives removed.
The story started last week with the annual cave restoration and cleaning project. Workers were checking the electric light system, when they discovered explosives, obviously several decades old, last Thursday. As we know from movies, old dynamite tends to become dangerous, as the nitro glycerine starts to sweat out of the bars and they become unstable. Because of this danger, the cave was immediatly evacuated, and the National Park Service’s regional expert in abandoned explosives, Dave Karplus, called in to assess the situation. Fortunately he works in Sequoia Kings Canyon. The cave remained closed for the weekend, until all explovies were removed completely.
It seems the dynamite originates from the 1930s, when the Civilian Conservation Corps constructed paths in the cave. They drilled three holes in the cave wall and equipped them with some kind of explosives to enlarge the narrow parts for the visitor trail. However, the amount of explosives was very small, as they only removed small pieces of rock to creat a smooth and almost natural look for the future show cave. The three unused charges were detonated, and so the cave is save again.
Such discoveries are rare but possible, as miners sometimes left, because of sickness or death, without removing their properties. The discoveries of dynamite cases happen now and then. Finders are advised to leave them untouched, stay away and call the officials. However, explosives in caves are extremely uncommon.
The explosives have not been discovered before, simply because they were located at a remote, narrow and never visited corner of the cave. The current work, the try to create a cave lighting system efficient enough to be powered by a solar panel, required work in several such places.
Dynamite found in Sequoia Park cave | visaliatimesdelta.com | Visalia Times-Delta and Tulare Advance-Register