You’d have to see it in person to fully appreciate Ozzie Sweet’s custom-built “semi-sub,” as the man himself called it. What’s a semi-sub? It’s a contraption Ozzie designed and, with the help of a friend, built in the 1970s to give him under-water photography options. Think of it as an airtight box that Ozzie could take into the water. With his camera inside, he could photograph scenes above and below the water’s surface. The semi-submergible unit wasn’t easy to lug around—it weighs north of 100 pounds—but it gave Ozzie an edge in a day when more and more photographers were vying for magazine cover space. He typically used it for photo shoots in fresh-water lakes in New England. And you can tell from the images here that he had loads of fun with the unit, often positioning models above and below a lake’s water line for unique scenes that his editors loved.