Alterra Bermuda Credit Agreement

Alterra Bermuda Credit Agreement. That certain Credit Agreement dated as of December 21, 2006 between Alterra Bermuda, as borrower, and The Bank of Nova Scotia, as administrative agent, as such agreement has been amended from time to time through the date hereof (and as such agreement is in effect on the Increase Effective Date without giving effect to any amendments or other modifications after the Increase Effective Date).