PADI Deep Diving Techniques & Planning 4 — Questions and Answers
Question 1: Which equipment item is considered essential and mandatory for every PADI deep dive?
- Underwater camera
- Dive knife
- Submersible pressure gauge (SPG) (Correct answer)
- Compass
Correct answer: Submersible pressure gauge (SPG)
A submersible pressure gauge is mandatory because monitoring remaining gas supply is critical for safe ascent planning on every dive, especially deep ones.
Question 2: At what approximate depth do most divers first begin to experience noticeable nitrogen narcosis?
- 33 feet (10 meters)
- 66 feet (20 meters)
- 100 feet (30 meters) (Correct answer)
- 130 feet (40 meters)
Correct answer: 100 feet (30 meters)
Noticeable narcosis typically begins around 100 feet (30 meters) for most divers, though individual susceptibility varies significantly.
Question 3: When using recreational dive tables for a deep dive, what is the definition of 'bottom time'?
- Time spent below 60 feet only
- Total elapsed time from leaving the surface to beginning the final ascent (Correct answer)
- Time spent at the maximum depth only
- Time from entering the water to exiting the water
Correct answer: Total elapsed time from leaving the surface to beginning the final ascent
Bottom time is measured from the moment you leave the surface to the moment you begin your final ascent, regardless of depth variations during the dive.
Question 4: A diver plans to reach a maximum depth of 130 feet. According to PADI guidelines, what is the recreational scuba depth limit this dive would approach?
- The recreational limit is 200 feet; this dive is well within limits
- The recreational limit is 130 feet; this dive is at the absolute maximum (Correct answer)
- The recreational limit is 100 feet; this dive exceeds safe recreational limits
- There is no defined recreational limit for certified divers
Correct answer: The recreational limit is 130 feet; this dive is at the absolute maximum
PADI sets the recreational scuba diving limit at 130 feet (40 meters), and dives to this depth should only be made by properly trained, experienced divers.
Question 5: What is the function of a delayed surface marker buoy (DSMB) deployed during ascent from a deep dive?
- It marks the dive site on the seafloor
- It alerts the surface crew to the diver's position and signals they are ascending (Correct answer)
- It provides additional lift to help tired divers ascend
- It measures exact water depth during ascent
Correct answer: It alerts the surface crew to the diver's position and signals they are ascending
A DSMB inflated and sent to the surface signals the boat crew where divers will surface, preventing boat strikes and aiding rescue if needed.
Question 6: During a deep dive briefing, the divemaster says 'stay within your personal limits.' What does this mean in practical terms?
- Dive only where water is warm enough for comfort
- Do not exceed your training, experience, and comfort level for depth and conditions (Correct answer)
- Remain within the boundary markers of the dive site
- Never go deeper than 60 feet regardless of certification
Correct answer: Do not exceed your training, experience, and comfort level for depth and conditions
Personal limits means acknowledging your own training, physical condition, experience, and comfort level, and not pushing beyond them even if conditions permit.
Question 7: Which symptom would most strongly suggest a diver is suffering from decompression sickness (DCS) after a deep dive?
- Sunburn on the back of the neck
- Joint pain or 'bends' appearing within 24 hours of surfacing (Correct answer)
- Mild headache immediately upon exiting the water
- Nausea during the boat ride back
Correct answer: Joint pain or 'bends' appearing within 24 hours of surfacing
Joint pain ('the bends') appearing within 24 hours of surfacing is a hallmark symptom of Type I decompression sickness and requires immediate oxygen first aid and medical care.
PADI Deep Diving Techniques & Planning 4
Which equipment item is considered essential and mandatory for every PADI deep dive?