One of the patients may have been digging an escape tunnel, the source added.
BBC: Blaze kills 38 at psychiatric hospital near Moscow
This showed that the propensity to build a long entrance tunnel and build an escape tunnel are genetically separate.
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Mr. Hu said Mr. Chen had been working on a way to escape since his confinement began in 2010 and that he had tried in 2011 to dig a tunnel into his neighbor's compound, but that it had been discovered by guards.
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