steven kurchin has investigated this case for "the boston globe" for decades.bbot told him this alarm was designed to keep visitors from getting too close to the rembrandt. >> that, even if you look at prints of it now, images of it now, you will see a vision, an etching, of rembrandt himself. art experts, art specialists, common folk would know that and they would come up and point their finger close to, point out the image of rembrandt. and if they got too close, then the alarm would sound. >> the thieves then smashed the alarm. >> that was a compelling detail to me. it seemed like that worked. you know, if you got too close, the sound would go off. and as i went through the rest of the security that was in place at the museum, nothing else was there to guard the museum's valuables. >> like the motion detectors, this alarm was not connected to the outside world. but did the thieves know that as well? because they didn't pack up and leave at that point. they continued on with their crime, and they took their time. one thief stayed behind in the dutch room and