- The Bermuda Triangle, known to soldiers as "the Graveyard of the Atlantic", is not recognized by the U.S. Navy as a danger zone.
- "And, if I may say so, sir, what with all the perils that Fantoma harbors, it is good to be serving in a danger zone under the command of my Lord Breetai once more.
- A red lamp is often a danger signal.
- They were a hundred feet clear of the danger zone.
- They regard overpopulation as a danger to society.