SDI OPEN WATER COMPREHENSIVE EXAM 2025/2026
QUESTIONS WITH ANSWERS RATED A+
✔✔Describe the symptoms of DCS, including mild to severe signs and symptoms. -
✔✔1. Rash or Crackling Skin
2. Joint Pain (most common symptom)
3. Difficulty Breathing
4. Cough
5. Numbness
6. Dizziness
7. Tingling
8. Paralysis
9. Temporary Blindness
10. Unconciousness
✔✔What is the depth threshold where most scuba divers begin to be affected by
nitrogen narcosis? - ✔✔100 feet
✔✔List two possible ways a diver may feel if they become "narked" at depth. -
✔✔Extreme Euphoria
Extreme Anxiety
✔✔What should a diver do to alleviate the symptoms of nitrogen narcosis? - ✔✔Ascend
normally until you no longer feel the affects
✔✔Which gas causes extreme headache and nausea, and in high enough
concentrations causes unconciousness and the lips and fingernails to turn bright red? -
✔✔Carbon Monoxide
✔✔What may indicate that the air in a scuba cylinder is dangerous to breath? - ✔✔Odor
or Taste
✔✔What should you do if you suddenly feel sick and develop a headache during a
dive? - ✔✔Make a controlled ascent to the surface. Breath fresh oxygen or air until the
symptoms clear up.
If symptoms do not clear up, seek immediate medical attention.
✔✔Failure to equalize the pressure in your ears on descent will result in
(A) Reverse Block
(B) Squeeze
(C) Nitrogen Overload - ✔✔(B) Squeeze
✔✔When a scuba diver holds his/her breath on ascent, he/she may:
QUESTIONS WITH ANSWERS RATED A+
✔✔Describe the symptoms of DCS, including mild to severe signs and symptoms. -
✔✔1. Rash or Crackling Skin
2. Joint Pain (most common symptom)
3. Difficulty Breathing
4. Cough
5. Numbness
6. Dizziness
7. Tingling
8. Paralysis
9. Temporary Blindness
10. Unconciousness
✔✔What is the depth threshold where most scuba divers begin to be affected by
nitrogen narcosis? - ✔✔100 feet
✔✔List two possible ways a diver may feel if they become "narked" at depth. -
✔✔Extreme Euphoria
Extreme Anxiety
✔✔What should a diver do to alleviate the symptoms of nitrogen narcosis? - ✔✔Ascend
normally until you no longer feel the affects
✔✔Which gas causes extreme headache and nausea, and in high enough
concentrations causes unconciousness and the lips and fingernails to turn bright red? -
✔✔Carbon Monoxide
✔✔What may indicate that the air in a scuba cylinder is dangerous to breath? - ✔✔Odor
or Taste
✔✔What should you do if you suddenly feel sick and develop a headache during a
dive? - ✔✔Make a controlled ascent to the surface. Breath fresh oxygen or air until the
symptoms clear up.
If symptoms do not clear up, seek immediate medical attention.
✔✔Failure to equalize the pressure in your ears on descent will result in
(A) Reverse Block
(B) Squeeze
(C) Nitrogen Overload - ✔✔(B) Squeeze
✔✔When a scuba diver holds his/her breath on ascent, he/she may:
