Across
- 1. personal alert safety system
- 4. related to breathing and the lungs
- 5. don't pass the ______ of no return
- 8. a heads up display
- 10. a(usually bad) gas emitted from something
- 11. another word for oxygen tanks
- 12. poisonous to living things
Down
- 2. self-contained breathing apparatus
- 3. a system giving constant oxygen
- 6. containing low levels of oxygen
- 7. a strap that attaches something to you
- 9. a SCBA system that makes your voice loud