Scuba Diving Advanced and Specialty Diving 2 — Questions and Answers
Question 1: What is the first step when a dive buddy signals 'out of air' underwater?
- Immediately offer your alternate air source (octopus) and begin a controlled ascent together (Correct answer)
- Signal to the surface and ascend alone quickly
- Donate your primary regulator and switch to your octopus yourself
- Try to locate a spare tank on the bottom
Correct answer: Immediately offer your alternate air source (octopus) and begin a controlled ascent together
Offer the octopus immediately so the out-of-air diver can breathe, then both divers ascend together in a controlled manner while maintaining physical contact.
Question 2: What is a 'controlled emergency swimming ascent' (CESA)?
- An out-of-air technique where the diver swims to the surface while exhaling continuously (Correct answer)
- A rapid emergency ascent to avoid a predator
- A buddy-assisted lift to the surface
- A slow ascent pausing every 10 feet
Correct answer: An out-of-air technique where the diver swims to the surface while exhaling continuously
A CESA is performed when a diver is out of air without a buddy — the diver swims to the surface slowly while continuously exhaling to prevent air embolism from expanding gas.
Question 3: What is the 'reverse block' in scuba diving, and when does it occur?
- Gas trapped in a sinus or ear cavity unable to vent during ascent, causing pain (Correct answer)
- A blocked regulator that prevents breathing during a dive
- Ear barotrauma from descending too fast
- A BCD that inflates unexpectedly
Correct answer: Gas trapped in a sinus or ear cavity unable to vent during ascent, causing pain
A reverse block occurs during ascent when expanding gas cannot escape from a sinus or middle ear due to congestion or mucus, causing significant pain and possible injury.
Question 4: What is the correct response if a diver's BCD inflates uncontrollably underwater?
- Dump air immediately using the dump valve or deflator, and vent manually if needed (Correct answer)
- Remove the BCD entirely underwater
- Ascend rapidly to reach the surface before full inflation
- Hold onto a fixed object to resist the lift
Correct answer: Dump air immediately using the dump valve or deflator, and vent manually if needed
An over-inflating BCD creates an uncontrolled ascent risk; the diver must immediately vent air through the deflator or oral dump valves to regain buoyancy control.
Question 5: What is 'task loading' in the context of diving safety?
- Being overwhelmed by multiple simultaneous tasks, degrading awareness and safety (Correct answer)
- The weight of equipment affecting swimming efficiency
- Carrying extra accessories that increase dive duration
- Training exercises designed to increase diver workload
Correct answer: Being overwhelmed by multiple simultaneous tasks, degrading awareness and safety
Task loading occurs when a diver has too many simultaneous demands — navigation, photography, buddy monitoring — reducing situational awareness and increasing error risk.
Question 6: What is the purpose of a dive briefing before entering the water?
- Communicate the dive plan, site conditions, hazards, signals, and emergency procedures to all divers (Correct answer)
- Assign tank sizes based on diver experience
- Collect liability waivers from participants
- Designate which divers will photograph the dive
Correct answer: Communicate the dive plan, site conditions, hazards, signals, and emergency procedures to all divers
A pre-dive briefing ensures all divers share the same plan, understand site-specific hazards, agree on hand signals, and know what to do in an emergency.
Scuba Diving Advanced and Specialty Diving 2
What is the first step when a dive buddy signals 'out of air' underwater?