Madeleine McCann murder suspect Christian Brueckner in a hunt for a network of secret cellars.A pal of Brueckner’s has claimed the child sex offender told him he wanted to build a Josef Fritzl-style dungeon.Police unearthed a cellar with a reinforced concrete foundation under his old allotment in Hanover, Germany.On Thursday they were set to hunt for a hidden underground room at a second allotment plot he ran 40 miles away in Braunschweig.Police are trying to unearth evidence about possible further crimes in connection with the convicted sex offender, including Madeleine’s disappearance.They spent three days searching the Hanover allotment where neighbours said Brueckner lived “off-grid” in a caravan in 2007 shortly after Madeleine.
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