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  1. Mariana Trench - Wikipedia

  2. The Mariana Trench Is 7 Miles Deep: What’s Down There?

  3. How Deep Is the Mariana Trench and What Have We Found in its ...

  4. How deep is the ocean? | Extremes, Comparisons, & Facts ...

  5. The Mariana Trench: All You Need to Know - Ocean Info

  6. Challenger Deep - Wikipedia

  7. What are the deepest spots in Earth's oceans? | Live Science