center meant a widespread police action. bill in central station was reopened within an hour of the diffuser all allowing the city to get back to business as usual. here quite a day here in berlin at the big table now i'm happy to welcome professor. he is a munitions expert from the university of technology professors good to have you on the show i mean well when you look at this this is an international news story but here in germany it happens all the time doesn't yes you're really right so but it is a very busy said he was usual and unusual events and today it was an extremely unusual event where the bomb. but has to diffuse a five hundred kilogram bomb unexploded bomb with british origin and i mean we've got a picture here of of the volume was there anything unusual or special about this bomb i mean we know that you know thousands of people were evacuated you know the