| Acronym | Meaning |
 | EAR | Expired Air Resuscitation |
| BSAC | British Sub-Aqua Club |
| MSDT | Master SCUBA Diver Trainer (PADI) |
| CESA | Controlled Emergency Swimming Ascent |
| NAUI | National Association Of Underwater Instructors |
| CNS | Central Nervous System |
| TDT | Total Dive Time |
| DL | Dive Leader (BSAC) |
| MCA | Maritime And Coastguard Agency |
| MSD | Master SCUBA Diver (PADI) |
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