Undersea Canyons Are Deeper Than the Grand Canyon.
The Mariana Trench isn’t the only depressions ocean floor. The deep ocean features some of Earth’s most mindblowing canyons and trenches, including some that are deeper than the Grand Canyon. The Zhemchug Canyon, located in the Bering Sea, is the largest known submarine canyon, stretching 2.6 kilometers (8,530 feet) down compared to the Grand Canyon’s 1.8-kilometer depth (8,530 feet). The Great Bahama submarine canyon is one of the deepest undersea cave systems in the world. These colossal underwater canyons are so large they can be seen from space.
Submarine canyons offer a one-of-a-kind peak into our planet’s geologic history and potential insight into how similar structure form on other planets. The formations develop along continental shelves and slopes, which are the underwater edge of a continent. Over time, water currents erode the earth and carve out the massive canyons winding thousands of feet beneath the coastline. These canyons are rich ecosystems, home to clams and worms that live in the canyon walls. Deepwater coral and sea sponges provide habitats for a diverse population of fish and invertebrates that live and swim along the sea floor.