Smoke is still rising from units 2 and 3, but is less visible, and is theorized to be steam following operations to spray water onto the buildings. Repair work resumes, after having been halted because of concerns over the smoke; it is felt safe because no significant changes in radiation levels have occurred. Work continues to restore electricity, and a supply cable is connected to unit 4. Injection of seawater into units 1–3 continues. External power cables are reported to be connected to all six units and lighting is back on again in the control room of unit 3.Hogg, Chris Stop-start work at Japan reactors BBC News Asia-Pacific, 22 March 2011, 15:44 GMT. Retrieved 22 March 2011Marin, Alex, "All reactors linked to outside power", Japan Times, 23 March 2011, p. 1.
