SSI OPEN WATER LATEST 2026 CORE EXAM MANUAL
QUESTIONS AND ANSWERS MARKED A+
✔✔The transfer of oxygen and nitrogen into the bloodstream occurs through the walls of
the:
-Arteries
-Bronchiole trees
-Alveoli
-Blood vessels - ✔✔-Alveoli
✔✔Which of the following would be inappropriate treatment for a diver evidencing
symptoms of Decompression Sickness?
-Giving them pure oxygen
-Taking the victim back underwater
-Giving them CPR
-Treat for shock - ✔✔-Taking the victim back underwater
✔✔The most serious lung overexpansion injury is:
-Arterial gas Embolism
-Mediastinal emphysema
-Pneumothorax
-Subcutaneous emphysema - ✔✔-Arterial gas Embolism
✔✔The term gradient can be described as: - ✔✔The difference between the internal
partial pressure and the external partial pressure of a gas
✔✔Which of the following overexpansion injuries can be characterized by chest pain,
breathing difficulties, weakness, and cyanosis (blueness) of the lips and nail beds:
-bends
-Subcutaneous emphysema
-Mediastinal emphysema and Pneumothorax
-Rupture of the eardrum - ✔✔-Mediastinal emphysema and Pneumothorax
✔✔In air at 1 ata, the partial pressure of nitrogen is___, oxygen is_____.
-.21/.79 ata
-1.5/.8 ata
- .79/.21 ata
- .8/.4 ata - ✔✔- .79/.21 ata
✔✔Gas can enter the bloodstream and cause serious damage to the lungs or even
death by:
-ascending to fast
-holding your breath underwater
-diving with respiratory congestion
, -all answers are correct - ✔✔-all answers are correct
✔✔The term No-decompression Limit is defined as: - ✔✔maximum allowed time at
depth without having to perform a mandatory decompression stop during the ascent
✔✔To use a compass to navigate to a sighted object: - ✔✔Point the compass toward
the object, rotate the bezel until the witness marks are over the magnetic needle, and
follow the lubber line
✔✔A dive computer keeps track of a diver's nitrogen absorption levels so that the diver
can:
-Avoid an Arterial gas Embolism
-Stay within the no decompression limits on each dive
-dive deeper than 100 feet
- Make decompression dives - ✔✔-Stay within the no decompression limits on each
dive
✔✔You should perform a safety stop at 15 feet for 3 to 5 minutes on every dive.
true
false - ✔✔true
✔✔What is a surface interval? - ✔✔The amount of time the diver stays out of the water
or on the surface between dives
✔✔Residual nitrogen is defined as: - ✔✔The amount of excessive nitrogen dissolved in
our blood stream and tissues after a dive
✔✔Two examples of hard coral are:
fire and star
elkhorn and staghorn
sea fan and brain
all answers are correct - ✔✔elkhorn and staghorn
✔✔More than ___ of Earth's oxygen is produced by marine plants. - ✔✔85%
✔✔A dependent action to take in response to an out of air emergency is:
- an emergency buoyant ascent
-sharing air using the primary second stage and using the alternate air source yourself
- a controlled swimming ascent
-all answers are correct - ✔✔sharing air using the primary second stage and using the
alternate air source yourself
QUESTIONS AND ANSWERS MARKED A+
✔✔The transfer of oxygen and nitrogen into the bloodstream occurs through the walls of
the:
-Arteries
-Bronchiole trees
-Alveoli
-Blood vessels - ✔✔-Alveoli
✔✔Which of the following would be inappropriate treatment for a diver evidencing
symptoms of Decompression Sickness?
-Giving them pure oxygen
-Taking the victim back underwater
-Giving them CPR
-Treat for shock - ✔✔-Taking the victim back underwater
✔✔The most serious lung overexpansion injury is:
-Arterial gas Embolism
-Mediastinal emphysema
-Pneumothorax
-Subcutaneous emphysema - ✔✔-Arterial gas Embolism
✔✔The term gradient can be described as: - ✔✔The difference between the internal
partial pressure and the external partial pressure of a gas
✔✔Which of the following overexpansion injuries can be characterized by chest pain,
breathing difficulties, weakness, and cyanosis (blueness) of the lips and nail beds:
-bends
-Subcutaneous emphysema
-Mediastinal emphysema and Pneumothorax
-Rupture of the eardrum - ✔✔-Mediastinal emphysema and Pneumothorax
✔✔In air at 1 ata, the partial pressure of nitrogen is___, oxygen is_____.
-.21/.79 ata
-1.5/.8 ata
- .79/.21 ata
- .8/.4 ata - ✔✔- .79/.21 ata
✔✔Gas can enter the bloodstream and cause serious damage to the lungs or even
death by:
-ascending to fast
-holding your breath underwater
-diving with respiratory congestion
, -all answers are correct - ✔✔-all answers are correct
✔✔The term No-decompression Limit is defined as: - ✔✔maximum allowed time at
depth without having to perform a mandatory decompression stop during the ascent
✔✔To use a compass to navigate to a sighted object: - ✔✔Point the compass toward
the object, rotate the bezel until the witness marks are over the magnetic needle, and
follow the lubber line
✔✔A dive computer keeps track of a diver's nitrogen absorption levels so that the diver
can:
-Avoid an Arterial gas Embolism
-Stay within the no decompression limits on each dive
-dive deeper than 100 feet
- Make decompression dives - ✔✔-Stay within the no decompression limits on each
dive
✔✔You should perform a safety stop at 15 feet for 3 to 5 minutes on every dive.
true
false - ✔✔true
✔✔What is a surface interval? - ✔✔The amount of time the diver stays out of the water
or on the surface between dives
✔✔Residual nitrogen is defined as: - ✔✔The amount of excessive nitrogen dissolved in
our blood stream and tissues after a dive
✔✔Two examples of hard coral are:
fire and star
elkhorn and staghorn
sea fan and brain
all answers are correct - ✔✔elkhorn and staghorn
✔✔More than ___ of Earth's oxygen is produced by marine plants. - ✔✔85%
✔✔A dependent action to take in response to an out of air emergency is:
- an emergency buoyant ascent
-sharing air using the primary second stage and using the alternate air source yourself
- a controlled swimming ascent
-all answers are correct - ✔✔sharing air using the primary second stage and using the
alternate air source yourself
