| SAA | Sub-Aqua Association | - | SMS Chat and Text |
| SAR | Search And Rescue/Recovery | - | SMS Chat and Text |
| SCUBA | Self Contained Underwater Breathing Aparatus | - | SMS Chat and Text |
| SCUDA | Self Contained Underwater Drinking Apparatus. Product That Can Be Used To Drink Underwater. | - | SMS Chat and Text |
| SCUHA | Self-contained Underwater Heating Apparatus (urinating In Your Wet Suit). | - | SMS Chat and Text |
| SI | Surface Interval | - | SMS Chat and Text |
| SPG | Submerssible Pressure Guage | - | SMS Chat and Text |
| SSI | Scuba Schools International; Diving Instruction Organization. | - | SMS Chat and Text |
| SWP | Safe Working Pressure | - | SMS Chat and Text |
