| Acronym | Meaning |
| CESA | Controlled Emergency Swimming Ascent |
| DO | Dive Officer (BSAC) |
| CMAS | Confederation Moniale Des Activities Subaquatiques |
| AMDT | Adjusted Maximum Dive Time |
| HSE | Health And Safety Executive |
| MCA | Maritime And Coastguard Agency |
| IAND | International Association Of Nitrox Divers |
| DAN | Divers Alert Network |
| DCI | Decompression Illness |
| SWP | Safe Working Pressure |