Twenty-six kids and a school bus driver survived being buried alive in 1976. Now, all three kidnappers are free

Three California rich kids hijacked a bus full of schoolchildren in 1976 and buried them underground, along with their driver. They then called in a ransom demand to local police before falling asleep and waking up to the news their victims had escaped. The final perpetrator, now 70, is only just leaving prison, writes Sheila Flynn