sub

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Across
  1. 2. – Below average (6 letters)
  2. 3. – Mental activity below awareness (12 letters)
  3. 5. – Break into smaller parts (9 letters)
  4. 6. – Underground train system (6 letters)
  5. 7. – A part of a larger section (10 letters)
Down
  1. 1. – Payment for regular access (12 letters)
  2. 2. – Stand-in or replacement (10 letters)
  3. 4. – Underwater vessel (9 letters)
  4. 5. – Below freezing point (7 letters)
  5. 6. – Sink or go underwater (8 letters)