| Acronym | Meaning |
 | TO | Training Officer (BSAC) |
| BFK | Big F*cking Knife (reference To The Diver's Knife) |
| HP | High Pressure |
| DIN | Deutsches Insitut Fuer Normung |
| RYA | Royal Yachting Association |
| MDT | Maximum Dive Time |
| MSDT | Master SCUBA Diver Trainer (PADI) |
| ADT | Actual Dive Time |
| ITS | Instructor Training Scheme (BSAC) |
| SCUHA | Self-contained Underwater Heating Apparatus (urinating In Your Wet Suit). |
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