This paper describes the history of geophysical exploration in a hydrocarbon reservoir underlying a large salt wall in the Southern North Sea. A considerable amount of technology bas been employed over the years to help solve this area's problems. Our aim is not to give a detailed critique of each techníque but to offer an interpreter's view on what helped with the interpretation and what did not. We hope that this work will benefit other interpreters and enable them to avoid the pitfalls that inevitably accompany sub salt interpretation, and so produce geologically feasible maps.