In August 2024, I was lucky enough to encounter this beautiful Trinchesia yamasui nudibranch while diving in Lembeh. It was feeding on its favourite food, the stinging white hydrozoan Hydroid aglaophenia, which provides nourishment and serves as a defence mechanism. Its position above the hydrozoan enabled me to take a close-up shot with a limited aperture, while still isolating the background. This resulted in a particularly detailed and clean image that required very little post-production editing.