A man described as a \"cold sadist\" imprisoned a woman in his homemade torture chamber rigged with eight bombs designed to detonate when he had finished with her. Thomas Fischer, 30, turned his tiny flat into a terrifying lair in which he had installed an old soundproofed telephone box to lock up his victim. He used an assortment of scalpels, needles and syringes to practice with on a mannequin before snatching the woman off a street in Hamburg. But while it appeared he had been planning to imprison her for a number of months, she was only in his clutches for two hours after he forgot to lock the door to the ‘cell.\'