These caves are mentioned in My Life with Charles Manson by Paul Watkins and Guillermo Soledad (1979):
"...I continued to work with Crockett and Brooks, but I was divided within myself. I can honestly say that no time in my life was more agonizing than the months between Charlie’s capture and his conviction. I walked a mighty thin line. The view from the middle often gives a panorama of all sides. But my balance was precarious at best, and what I paid for that vantage point in suffering was more than I could afford. That I survived at all appears, in retrospect, something of a miracle.
"The hillsides around Shoshone are riddled with manmade caves, dug originally by itinerant miners, prospectors, and other vagabonds, who, over the years, found the town a convenient oasis in the scorching lowlands of the Amargosa Valley. Shoshone was also a water stop on the railroad line and for a time the site of a thriving hobo jungle which centered in and around the tufa caves. Crockett and Poston were broke and living in one of those caves when I arrived on October 9. Don Ward had told them (as he did me) not to leave Shoshone, that the Barker Ranch was about to be busted.
"The following day, just before dawn, while the three of us slept off a reunion celebration on the floor of the cave, officers from the highway patrol, the Inyo county sheriff’s office, and the national park rangers assembled near Golar Wash for a raid on the Barker Ranch—a raid that lasted three days and resulted in the capture of Charlie and most of the Family. All were taken to the Inyo county seat in Independence (just four hours north of Shoshone) and booked for auto theft.
"I didn’t know then, nor did Brooks or Crockett, that during the raid Stephanie (Schram) and Kitty Lutesinger (Bobby Beausoleil’s girlfriend, who was then five months pregnant with his child) had been trying to escape from the Family. They asked the police for protection and were taken to Independence to be interviewed by detectives. When it was learned that Kitty was Bobby’s girlfriend, she was asked what she knew about the Hinman murder. She said she had heard that Manson sent Bobby and a girl named Susan Atkins to Hinman’s house to collect some money and that when he refused to pay, they had killed him."