GASCADE operates a natural gas transmission pipeline system which links suppliers and customers in Germany and is directly connected to major European transit pipelines and LNG terminals. Although the entire pipeline system is piggable from a structural perspective, challenging operating conditions do not allow the application of free-swimming ILI tools using standard practices for about 10% of GASCADE’s network. These Difficult-To-Inspect (DTI) pipeline segments require a different approach to acquire inspection data for pipeline integrity assessment and future maintenance planning. Either significant operating expenses are required to apply standard practices or different tools that can accommodate given operating conditions. In a collaboration project GASCADE successfully applied Intero’s tetherless, self-propelled and remotely operated Pipe Explorer robotic MFL technology to inspect a 6-inch low-flow branch line segment. This contribution provides details of this project. The paper covers GASCADE’s DTI pipeline assessment and inspection tool selection process complementing established direct assessment (DA) methods. Sensitive items of particular importance of Intero’s Pipe Explorer work programme, on-site preparation and tool operation are discussed. Data integration of Pipe Explorer inspection results is presented and comparison with existing DA results is discussed.