SSM Industries received a letter from Sigma claiming S$503,448.10 under an insurance guarantee due to SSM's alleged failure to fulfill its obligations under a sub-contract. However, SSM argues that Sigma failed to provide any details of the alleged breach or how it caused a loss. As such, SSM takes the position that there is no valid basis for the claim on the insurance guarantee. SSM requests that further particulars be obtained from Sigma before proceeding with any payment under the guarantee.