Todd Bretl says he asks himself ‘Would I hang this on my wall?’ when he’s composing his photos of marine life. Challenging himself with this question has helped him produce some stunning works of art. Some of his images call to mind glass sculpture, while others capture the wildness that thrives below the water’s surface. He answered our questions about his process and gear – take a look at some of his work and find out more about how it’s created. See gallery