Polls will open at 7 a.m. local (0400 GMT) Sunday as Greeks vote in a snap referendum to decide whether to accept more austerity attached to a fresh bailout loan or reject it.

It is a high-stakes referendum likely to determine whether it leaves the euro-currency area after seven years of economic pain.

It may also decide whether the government of Prime Minister Alexis Tsipras survives. Finance Minister, Yanis Varoufakis has already indicated that he will resign if the Greeks vote Yes to the austerity programme.

Voting will end at 7 p.m, with the first official projection of the result expected at 9 p.m.

Staged against a backdrop of shuttered banks and threats of financial apocalypse, the vote is too close to call and may not produce the clear mandate for negotiations that Athens’ creditors seek.

Greeks are split on whether to accept an offer by creditors that Prime Minister Alexis Tsipras calls a “humiliation” and is urging people to reject.

Investors and European policymakers say a rejection would set Greece on a path out of the euro, destabilizing the global economy and financial markets.

“On Sunday we should all send a message of democracy and dignity to the world,” Tsipras told tens of thousands of Greeks rallying for a ‘no’ vote before campaigning ended.

Greece has a debt burden of $270 billion and last Tuesday technically defaulted in repayment to the International Monetary Fund of a sum of 1.6 billion euro.