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It’s hard to overstate the size of the deal that could fall through for Credit Suisse – with its half a trillion dollars in assets and more than 50,000 employees worldwide.

failed last week Silicon Valley Bank and Signaturetwo much smaller regional lenders, has shaken investor confidence around the world.

Andrew Kenningham, chief European economist at Capital Economics, writes that Credit Suisse, one of Europe’s largest lenders, is “more globally connected, with many subsidiaries outside of Switzerland, including the US”.

Credit Suisse is known as a “systemically important global bank” (or “G-SIB” as the cool kids call it).

Once one of these huge banks gets in trouble, people start to wonder what’s going on with the system and speculate about who might be next to fall.

Even with a financial lifeline from the Swiss authorities, there is still plenty of risk and unknowns emanating from Credit Suisse, keeping investors on edge.

Credit Suisse’s turmoil indicates that the crisis has not been contained, according to Arthur Wilmarth, a professor at the George Washington School of Law.

“I think it was very naive for most people to think it might be contained by just a couple of regional banks, because clearly there are still shocks reverberating within our banking system,” Wilmarth said. “This would indicate that it is likely to spread to very high volume banks.”