"Credit default swaps (CDS) measuring risk on German, French and Dutch bonds have surged over recent days, rising significantly above the levels of non-EMU states in Scandinavia.

"Germany cannot keep paying for bail-outs without going bankrupt itself," said Professor Wilhelm Hankel, of Frankfurt University. "This is frightening people. You cannot find a bank safe deposit box in Germany because every single one has already been taken and stuffed with gold and silver. It is like an underground Switzerland within our borders. People have terrible memories of 1948 and 1923 when they lost their savings."

While Germany's public and private debt is not extreme, it is very high for a country on the cusp of an acute ageing crisis. Adjusted for demographics, Germany is already one of the most indebted nations in the world.

Reports that EU officials are hatching plans to double the size of EU's