PADI Deep Diving Techniques & Planning 5

Question 1

You are planning a deep dive to 100 feet in a location with a known thermocline at 60 feet. How should this affect your planning?

Accepted Answer

Plan for significantly reduced water temperature below 60 feet and pack appropriate exposure protection

Answer

The thermocline has no impact on dive planning

Answer

Avoid diving past the thermocline entirely

Answer

The thermocline will reduce nitrogen absorption and allow longer bottom time

Question 2

What is 'residual nitrogen' and how does it affect planning for a second dive?

Accepted Answer

Nitrogen remaining dissolved in body tissues after a dive; it reduces NDL on subsequent dives

Answer

Nitrogen left in your tank; it must be refilled before a second dive

Answer

Nitrogen bubbles visible in the water after exhalation

Answer

Nitrogen locked in wetsuit foam that affects buoyancy

Question 3

Why should deep dives always be conducted as the FIRST dive of the day when planning multiple dives?

Accepted Answer

Residual nitrogen from earlier shallow dives reduces available NDL at depth, increasing DCS risk

Answer

Deeper dives are more tiring so should be done when energy is highest

Answer

Visibility is always better for deep dives in the morning

Answer

Boat captains prefer to go deep first for scheduling purposes

Question 4

A deep diver notices their air consumption rate is twice as fast as in shallow water at the same exertion level. What is the BEST explanation?

Accepted Answer

Increased pressure at depth compresses each breath, requiring more gas molecules per inhalation

Answer

The regulator is malfunctioning

Answer

The diver is hyperventilating due to narcosis

Answer

Cold water causes faster metabolism and higher breathing rate

Question 5

When using a dive computer for a deep dive, what should a diver do if they accidentally exceed the planned maximum depth?

Accepted Answer

Monitor the computer's updated NDL and adjust bottom time accordingly, then ascend normally

Answer

Ascend immediately at emergency ascent speed

Answer

Continue the dive normally; the computer will automatically adjust all calculations

Answer

Surface immediately and call for emergency assistance

Question 6

What is the recommended action if a diver feels the effects of nitrogen narcosis severely impairing their judgment at depth?

Accepted Answer

Ascend to a shallower depth until symptoms improve, then reassess whether to continue

Answer

Breathe faster to reduce carbon dioxide buildup

Answer

Continue the dive while buddy keeps close watch

Answer

Descend further to equalize pressure on the nervous system

Question 7

Which pre-dive check is MOST critical specifically for deep dives compared to shallow recreational dives?

Accepted Answer

Verifying adequate gas supply and gas-sharing capability with buddy

Answer

Mask fit and strap condition

Answer

Checking fin strap buckles

Answer

Confirming wetsuit zipper is fully closed