Years ago in the Seattle area a guy killed his wife and daughter, then went to escape to his bunker. Also in a hiking area. He had spent 8 years building it. IIRC they found him just a week after he killed his family. He killed himself as the cops started trying to get into his hole in the ground.
Read a story years ago about a guy and his daughter who lived in a cave in Oregon. He was just down on his luck and living off the grid. When they were found, they’d been living there a couple years. He was homeschooling his daughter using a Bible and an old encyclopedia.
The girl tested well above her grade level. To the credit of the cops, instead of busting him, they arranged a job on a local ranch that included room and board.