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FRANKFURT, GERMANY - JULY 06: The Euro sculpture, near the old ECB headquarters, undergoes maintenance on July 6, 2015 in Frankfurt, Germany. The DAX dropped slightly in the morning though investors remain cautious as the consequences of the referendum remain uncertain. Greeks voted in a strong majority against the reform plan proposed by the troika of the European Central Bank, the International Monetary Fund and the European Commission in a move that many fear will lead to a departure by Greece from the Eurozone. (Photo by Hannelore Foerster/Getty Images)
FRANKFURT, GERMANY - JULY 06: The Euro sculpture, near the old ECB headquarters, undergoes maintenance on July 6, 2015 in Frankfurt, Germany. The DAX dropped slightly in the morning though investors remain cautious as the consequences of the referendum remain uncertain. Greeks voted in a strong majority against the reform plan proposed by the troika of the European Central Bank, the International Monetary Fund and the European Commission in a move that many fear will lead to a departure by Greece from the Eurozone. (Photo by Hannelore Foerster/Getty Images)

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How does the ECB control Greek banks?

Greece's banks are running on emergency power and the ECB can turn it off at anytime. CNN's Clare Sebastian explains.

How does the ECB control Greek banks?

Greece's banks are running on emergency power and the ECB can turn it off at anytime. CNN's Clare Sebastian explains.