Alls well on Cheju Island after a power outage:

Two undersea power transmission cables malfunctioned for unknown reasons at 10:36 a.m., sparking the blackout, the exchange said.

“One of the two lines was fixed to enable the supply of power to Jeju,” state power monopoly Korea Electric Power Corp. (KEPCO) said. “But the other remained out of service.”
An investigation was under way to determine the cause of the malfunction, KEPCO said, adding that the cables might have been damaged by fishermen.

The two cables transmit electricity from a substation in Hanam, about 420 kilometers southwest of Seoul, to the island, accounting for about 30 percent of its power consumption.

Regional emergency rescue offices were flooded with calls from people trapped in elevators, officials said.

The power outage disrupted flights and resulted in severe traffic congestion in the region’s densely populated areas as traffic signals failed to operate.

Could you imagine the chaos if Seoul had a similar power outage?