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  1. How to swim underwater - YouTube

  2. The science of underwater swimming: how staying submerged …

  3. How to Swim Underwater | Swimming Lessons - YouTube

  4. The science of underwater swimming: How staying submerged …

  5. Swimming Lesson: How to Swim Deep Underwater - YouTube

  6. How to Stay Underwater in a Swimming Pool (with Pictures) - wikiHow

  7. 5 Swimming Tips to Improve Your Underwaters - SwimSwam

  8. Improving Your Underwater Game | U.S. Masters Swimming

  9. 3 Ways to Swim Underwater Without Holding Your Nose - wikiHow