In 2007, PGS took the industry by surprise with the launch of the GeoStreamer, the dual-sensor towed streamer that kick-started the broadband revolution. But how did they solve the riddle of combining the hydrophones and geophones into broadband measurements? For most geophysicists, it was seen as ‘a mission impossible’. It turned out to be so simple, so elegant, and so brilliant. It was a fantastic journey, of course with setbacks, but with persistence, a culture of innovation, and outstanding geophysical work, they won. Their achievement represents maybe the largest single step in the technological development of the marine seismic streamer.