| Acronym | Meaning |
 | OWI | Open Water Instructor (BSAC) |
| TDT | Total Dive Time |
| BHA | British Hyperbaric Association |
| DAN | Divers Alert Network |
| NAUI | National Association Of Underwater Instructors |
| C-CARD | Scuba Diving Certification Card. |
| HSE | Health And Safety Executive |
| END | Equivalent Narcotic Depth |
| CAGE | Cerebral Arterial Gas Embolism |
| DSMB | Delayed Surface Marker Buoy |
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