Prefixes: en, em, in, im, over, sub & inter

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Across
  1. 3. too much time
  2. 4. a way to travel underground
  3. 5. a lot of joy
  4. 7. a connection between networks
  5. 8. to put time or money towards something
  6. 9. to allow something to be able to work
  7. 12. to include
  8. 13. to employ someone
  9. 14. too much loaded up
Down
  1. 1. too much confidence
  2. 2. a marine vessel that goes beneath the sea
  3. 6. between nations
  4. 7. to breathe in
  5. 8. to explode but fall within
  6. 10. to cause a feeling of power
  7. 11. to have joy