Abstract

The Mariana Trench, Earth's deepest oceanic abyss, is a realm of extremes—unfathomable depths, crushing pressures, near-freezing temperatures, and perpetual darkness. Despite these harsh conditions, life thrives in surprising forms, including deep-sea macroalgae that cling to the boundaries of light and darkness in this remote environment. These resilient organisms provide a glimpse into the adaptations necessary to survive in one of Earth's most challenging habitats