Ocean exploration

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Across
  1. 3. Having or showing unfriendliness or opposition
  2. 4. Necessary and urgent
  3. 7. The act of staying alive, especially in difficult conditions
  4. 9. Extremely important
Down
  1. 1. Special skill or knowledge in a particular field
  2. 2. To watch carefully
  3. 5. To travel in search of discovery
  4. 6. A sum of money provided for a particular purpose
  5. 8. To have an effect on someone or something