| Acronym | Meaning |
 | CESA | Controlled Emergency Swimming Ascent |
| DSMB | Delayed Surface Marker Buoy |
| DCS | Decompression Sickness |
| OWIC | Open Water Instructor Course (BSAC) |
| OW | Open Water Certification; First Certification Level. |
| DAN | Divers Alert Network |
| BT | Bottom Time |
| DIN | Deutsches Insitut Fuer Normung |
| BHA | British Hyperbaric Association |
| TNT | Total Nitrogen Time |
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