VOICESPhotos (L to R):The Klein SMARTFISH com-bined side scan sonar-sub-bot-tom pro? ler. Capable of opera-tion at full ocean depth.Inset: One of the ? rst devices able to produce a side scan sonar record on a cathode-ray-tube screen.Marty Klein with a section of the Wellington Bomber that he helped to ? nd in Loch Ness in 1976.Marty Klein today.Photos courtesy Martin Klein and the MIT Museum.One of the biggest changes is the change to digital. The old ma-chines used to use a mechanical graphic recorder with analog sig-nal processing. It worked, but it had all sorts of problems, it was expensive to make, it was dif? cult to operate. sonar or I invented side scan sonar. He did not, and I did not. these technologies. I certainly didn’t do it on my own. I had But what I did was introduce to the world 50 years ago a com- a lot of help. A lot of things, you can go to the library and get mercial version that was affordable, that was rugged, that was a book on how to make a garden – whatever – how to cook a reliable, that produced good results. And I really feel proud meal. But there’s still a lot of technology to learn and develop, that it did change the world of ocean exploration. and a lot of it is still challenging. I still love this