Catherine Holmes is a multi-award-winning underwater photographer who transitioned from a casual hobbyist to a professional. She started her diving journey in Australia and improved her photography skills by taking trips and learning from other photographers. Catherine emphasizes the importance of comfort in water and good buoyancy control for underwater photography. She suggests joining photography communities and going on dedicated photo trips to enhance skills. Her favorite diving locations include Raja Ampat and the Red Sea, where she captures the vibrant colors of marine life.