| Acronym | Meaning |
 | DSMB | Delayed Surface Marker Buoy |
| END | Equivalent Narcotic Depth |
| MSD | Master SCUBA Diver (PADI) |
| BFK | Big F*cking Knife (reference To The Diver's Knife) |
| HID | High Intensity Discharge |
| SAR | Search And Rescue/Recovery |
| OW(D) | Open Water (Diver) (PADI) |
| TO | Training Officer (BSAC) |
| CCR | Closed Circuit Rebreather |
| DPV | Diver Propulsion Vehicle |
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