padi IDC theory – SCUBA physiology

Q8
After a dive a diver displays the signs and symptoms of tunnel vision and cherry red nail beds. What is the most likely cause?
c)    Contaminated air poisoning

Q9
The greatest risk from forceful equalizing using the Valsalva manoeuvre is potential
a)    Ear drum rupture
b)   Sinus rupture
c)    Round window rupture
d)   A bad cough the next morning