By ERIK VERDUZCO, JEFF AMY and KIMBERLEE KRUESI SWANNANOA, N.C. — Many residents of the Carolinas still lacked running water, cellphone service and electricity Wednesday as rescuers searched for people unaccounted for after Hurricane Helene caused catastrophic damage across the Southeast and killed at least 166 people. President Joe Biden will survey the devastation in the two states as floodwaters receded and revealed more of the death and destruction left in Helene’s path. More than 1.2 million customers still had no power Wednesday in the Carolinas and Georgia, where Helene tore far inland after initial landfall on Florida’s Gulf Coast.