5.3 If for any reason, a Venturer sustains any liabilities or is required to pay any losses arising out of or directly connected with the construction of the Project, or the execution of any surety bonds or indemnity agreements in connection therewith, which are in excess of its Percentage of Participation, in the Joint Venture, the other Venturer shall promptly reimburse such Venturer this excess, so that each and every member of the Joint Venturer will then have paid its proportionate share of such losses to the full extent of its Percentage of Participation.