SUB-

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Across
  1. 2. A smaller story that happens alongside the main story.
  2. 4. To split something into smaller parts.
  3. 5. A person or company hired to do part of another company's job.
  4. 6. Existing or happening underground.
  5. 7. A topic being studied or discussed.
  6. 8. A watercraft designed to travel underwater.
Down
  1. 1. A company owned or controlled by a larger company.
  2. 3. To sign up to receive something regularly.
  3. 5. To try to weaken or overthrow a system or authority.
  4. 6. Not obvious or easy to notice.