**Exploring+the+Deep+Glossary

__Exploring the Deep Glossary __

**SCUBA**  – **S** elf- **C** ontained **U** nderwater **B** reathing **A** pparatus; A portable device containing compressed air and used for breathing under water



A scuba suit.

**SONAR**  – **SO** und **N** avigation **A** nd **R** anging; A system for the detection of objects under water and for measuring the water's depth by sending out sound pulses and detecting or measuring their return after being reflected.

How SONAR works.


 * NITROGEN NARCOSIS ** - A drowsy state induced by breathing air under higher than atmospheric pressure