| Acronym | Meaning |
 | RD | Rescue Diver (PADI) |
| SCUHA | Self-contained Underwater Heating Apparatus (urinating In Your Wet Suit). |
| BHA | British Hyperbaric Association |
| NAUI | National Association Of Underwater Instructors |
| AAS | Alternate Air Source |
| HSE | Health And Safety Executive |
| SI | Surface Interval |
| OWSI | Open Water SCUBA Instructor (PADI) |
| PPB | Peak Performance Bouyancy |
| DEMA | Diving Equipment Manufacturers Association |
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