scuba diving [l3]

• Scuba diving


  A mode of underwater diving where the diver uses a Self-contained Underwater Breathing Apparatus (scuba)
• Scuba diving


  • May be done recreationally or professionally in a number of applications, including scientific, military and public safety roles
  • Most commercial diving uses surface-supplied diving equipment when this is practicable

  
• History of scuba diving


  1. 1300s: Simple cauldron in the shape of a bell used to trap air for divers

  2. 1690: Edmund Halley developed improved diving bell

  3. 1715: John Lethbridge built "diving engine" with compressed air

  4. 1825: William James invented first workable, full-time SCUBA

  5. 1843: First diving school established by Royal Navy

  6. 1866: Benoit Rouquayrol & Auguste Denayrouze patented "Aerophone" with compressed air tank

  7. 1876: Henry A. Fleuss developed first self-contained diving gear using compressed oxygen

  8. 1943: Jacques Cousteau and Emile Gagnan redesigned car regulator into the "aqualung"
• Swimming skill requirements for one-day scuba experience course

  • Comfortable in water even to deep end of swimming pool
  • Able to tread water for 10 minutes, swim 200 meters, and snorkel 300 meters without stopping

  
• Scuba diving equipment


  • Dive Mask
  • Snorkel
  • Regulator
  • BCD or Buoyancy Control Device
  • Wetsuit
  • Fins
  • Scuba Tanks

  
• Underwater communication signals


  • "I am going up" (End of dive)
  • "I am going down"
  • "Which direction?"
  • "OKAY SIGNAL WHEN ON THE SURFACE AT A DISTANCE" (Clear Space)
  • "Something is wrong"
  • "Distress or Help Me!"
  • "Turn Around"
  • "Hold Hands"
  • "Out of Air"
  • "Get with your buddy"
  • "Who will lead, Who will follow"
  • "Level off at this depth"
  • "Take it easy or slow down"
  • DANGER IN THAT DIRECTION
  • SAFETY STOP
  • I am cold
  • Watch or Look
  • Boat
  • "I cannot clear my ear"
  • I have cramps
  • "I am stuck"