Televised ducts under slab floor. Ducts are concrete possibly Transite with asbestos with metal fittings and connections that are heavily rusted. There was standing water in the line in the back of the house. All downspouts need to be extended away from the house to help reduce water level. The back patio is also cracked and pitching towards the house. There is also room wher the ground against the house could be raised and pitched away from the house. After water issue is resolved the ducts should be spin cast mortared and spray lined with Duct Armor duct lining material.