Although the limitations of the building had been carefully concealed during its construction, Borovoi and his team now found gaps in the walls large enough for a man to pass through and cracks through which water could penetrate and radioactive dust could escape. They also began to fear that, inside the Sarcophagus, what remained of the concrete skeleton of Unit Four could soon collapse. By the time Borovoi was recalled to Moscow, it had become clear that a new means of protecting the world from the remains of the still-hot reactor would have to be found.
