| Acronym | Meaning |
 | TP | Test Pressure |
| BC | Bouyancy Compensator |
| CCR | Closed Circuit Rebreather |
| CESA | Controlled Emergency Swimming Ascent |
| TDT | Total Dive Time |
| HSE | Health And Safety Executive |
| OWI | Open Water Instructor (BSAC) |
| ITC | Instructor Training Course (BSAC) |
| RD | Rescue Diver (PADI) |
| CMAS | Confederation Moniale Des Activities Subaquatiques |
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