Reactor turbine basements flooded with highly radioactive materials kept a desperate effort to stabilize the Fukushima No. 1 power plant at bay Monday, as fresh data showed that nearby seawater was being contaminated further by the leaking facility.

Efforts by Tokyo Electric Power Co. to restore the cooling systems for reactors No. 1 through 4, as well as their spent-fuel storage pools, continue to be halted by the highly radioactive water, which is now at lethal levels.

Later in the day, Tepco said the strong radiation had been detected outside the turbine buildings as well, but in an area that could explain how the toxic material is contaminating the sea.