How much have humans explored the ocean?

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Across
  1. 3. Exploration of the ocean and its phenomena.
  2. 4. Underwater vehicle used for exploration.
  3. 8. Deepest known part of the world's oceans.
  4. 9. Diverse underwater ecosystems are formed by coral.
  5. 10. Marine specialists who explore underwater environments.
Down
  1. 1. Efforts to protect and preserve marine ecosystems.
  2. 2. U.S. agency focused on oceanic and atmospheric research.
  3. 5. The study of underwater depth of ocean floors.
  4. 6. VENTS Openings in the sea floor that emit heated water.
  5. 7. A journey undertaken for a specific purpose, such as exploration.