on 25 march 2011, officials announced the reactor vessel might be breached and leaking radioactive material. high radiation levels from contaminated water prevented work. japan nuclear and industrial safety agency (nisa) reiterated concerns about a unit 3 breach on 30 march. nhk world reported the nisa's concerns as "air may be leaking", very probably through "weakened valves, pipes and openings under the reactors where the control rods are inserted", but that "there is no indication of large cracks or holes in the reactor vessels". as with the other reactors, water was transferred from condenser reservoirs to the suppression pool surge tanks so that condensers could be used to hold radioactive water pumped from the basement.