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Leon Davidson, in an early issue of Flying Saucers Magazine, spoke of a large network of "underground tunnels in the California desert, at Camp Irwin, near Barstow."
This may tie-in with an item related by a Los Angeles municipal water director, as related in an early issue of Richard Toronto's Shavertron letter-zine, stating that this water director knew of 5 large underground rivers which ran beneath the Mojave desert, and that die-traces showed that at least one of these emptied into the Pacific ocean through openings in the continental slopes (One source stated that such a river exited in the Gulf of California).
Other sources speak of a "Kokoweef" river-system which is alleged to lie below Kokoweef peak just east of Fort Irwin, which looked- -according to it's alleged discoverer, a Mr. Earl Dorr, and a few "Indians" who also claimed to have been in it--like a "Grand Canyon" underground.
It allegedly consists of a river chasm generally 500 ft. wide and over a thousand feet high-deep, sided by steep tiered-shelved underground cliffs, huge stalactites and cataracts. Also, the alluvial sands on the 'beaches' along the river, which allegedly hold a large percentage of gold dust, are said to be several feet deep. The entrance to this cavern was allegedly dynamited shut by Mr. Dorr to protect anyone else from getting to "his" gold. There is in fact evidence that Dorr did dynamite shut the lower level of 'Kin Sabe' cave in Kokoweef Peak, and there are present-day attempts to break through into this underground system. The water of the river allegedly rose and fell with the tides, suggesting that a very large body of water might exist upstream, that is if Dorr's account as well as the accounts of the Indians were not fabricated).
The municipal water director, according to the Shavertron article, spoke with a man who claimed that he was hired several years ago by the government to look for water sources for Ft. Irwin. He alleged to have explored an old mine in the area and found that deep down, the shaft intersected with an ancient earth fault or chasm- like cave which continued horizontally for a considerable distance. This government employee followed the chasm and allegedly emerged onto the bank of a huge underground river-cave over a quarter of a mile wide! The tremendous water flow-- possibly originating from the waters that apparently disappear beneath the Great Basin, the Nevada and Mojave deserts? -could have 'fed' the water needs of all of Southern California.
Paul Doerr (not to be confused with Mr. Dorr referred to above), in issue number 6 of his Newsletter Unknown, reports on the discovery of massive caverns in Toulumne Co., California, by three Oakland miners. The caverns were so extensive that a man would have to "take grub for a week, and plan to explore for a month."