Televised ducts under slab floor. Ducts are galvanized metal ducts that are extremely rusted. There was standing water in the main run. Suggest coring through foundation below level of ducts then installing perforated pipe and connecting it into the current drainage that is installed on the sides of the house. After water issue is resolved the ducts should be spin casting and mortared to restore structure then spray lined with Duct Armor duct lining material.