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233 Skip breathing ............................................................. 115 Slate, underwater ........................................................... 44 Sneezing ....................................................................... 116 Snorkeling vest .............................................................. 19 Snorkels Blast clearing ............................................................ 54 Displacement clearing ............................................. 54 Features .................................................................... 16 Purpose ..................................................................... 16 Selecting ................................................................... 17 Using ......................................................................... 48 Sound signals ................................................................ 82 Sound, transmission of ................................................. 96 Spare parts ..................................................................... 45 Special dive table rules Altitude diving ........................................................ 139 Cold or strenuous dives .......................................... 139 Decompression ....................................................... 137 Flying after diving .................................................. 139 Omitted decompression.......................................... 138 Required decompression ........................................ 138 Specialty courses .......................................................... 198 Spined marine life ....................................................... 186 Sport diver’s flag ............................................................ 43 Squeezes Definition................................................................ 107 Dry suit ................................................................... 111 Mask space .............................................................. 111 Middle ear ............................................................... 107 Sinuses .................................................................... 110 Teeth ....................................................................... 111 Standing current.......................................................... 184 Starvation, air .............................................................. 115 Steel cylinders ................................................................ 20 Stinging marine life .................................................... 187 Stingray ........................................................................ 186 Streamlining, reduction of drag by .............................. 97 Strenuous dives, rules for ............................................ 139 Stroke, heat .................................................................. 161 Subcutaneous emphysema ......................................... 114 Submersible pressure gauge.............................. 23, 56, 72 Surf ............................................................................... 182 INDEX Surface dives Feet first .................................................................... 53 Head first .................................................................. 52 Pike ........................................................................... 52 Tuck .......................................................................... 52 Surface flotation ............................................................ 72 Surface Interval Time (SIT) table .............................. 128 Surface intervals, dive planning ................................. 136 Surge ............................................................................ 182 Swells............................................................................ 182 Swimming pool, learning diving skills in ...................... 9 T Tanks.............................................................See Cylinders Technical diving .............................................................. 5 Temperature Core body .................................................................. 37 Water ....................................................................... 181 Terrain, underwater..................................................... 179 Texas, diving ................................................................ 193 Thermal effects of diving .................................... 119, 160 Thermal protection........................................................ 37 Thermocline ................................................................ 181 Tidal currents .............................................................. 184 Tides ............................................................................. 183 Timing devices ............................................................... 31 Tissue emphysema ...................................................... 113 Total nitrogen time (TNT) .......................................... 128 Toxins .......................................................................... 186 Training assistant specialty course ............................. 199 Transitory currents ...................................................... 184 Trap door effect, Eustachian tube and ....................... 107 Trash, conservation and .............................................. 190 Trim, gear and ............................................................... 33 Truk Lagoon, diving .................................................... 193 Turks & Caicos, diving ................................................ 193 Types of dive sites ........................................................ 176 INDEX


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