In science, a trench refers to a long, narrow depression on the seafloor that forms at the boundary of tectonic plates where one plate is pushed, or subducts, beneath another. These trenches are the deepest parts of the ocean and are characterized by a V-shaped profile. They are formed as a result of tectonic activity, which describes the movement of the Earths lithosphere. Ocean trenches occupy the deepest layer of the ocean, the hadalpelagic zone, and have unique habitats due to the intense pressure, lack of sunlight, and frigid temperatures. The development of new deep-sea technology, from submersibles to cameras to sensors and samplers, has provided greater opportunities for scientists to systematically investigate trench ecosystems over extended periods of time. The study of trenches can provide a better understanding of earthquakes and geophysical processes, revise how scientists understand the global carbon cycle, provide avenues for biomedical research, and potentially contribute new insights into the evolution of life on earth.