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york. and new this morning a dramatic controlled demolition overnight in surfside, florida. late last night engineers used explosive charges to bring down what remained of the shamplain towers south so that search teams can continue look for searching for survivors more safely. now it has been 12 days sin that huge chunk of the tower collapsed, 121 people remain unaccounted for. officials have confirmed 24 people were killed. cnn's natasha chen is live for us this morning in surfside. good morning to you. so it may seem counter intuitive to folks at home, but this full demolition is actually supposed to make the recovery efforts easier now. explain how that works. >> reporter: that's right, laura. this is definitely safer now for search and rescue teams to continue. that space behind us between the buildings right there, that's where the shamplain towers south used to be, and now it is not.