What Happens If

Question 1

Who has responsibility for diving operations

Answer 1

Dive manager

Question 2

What does the dive leader do?

Answer 2

Responsibility for the execution of dive plan underwater

Question 3

What is an SMB

Answer 3

Surface marker buoy

Question 4

What can an SMB be used for?

Answer 4

Signalling device to the boat and also keeps buddy pair together

Question 5

What is the incidence pit?

Answer 5

Resolve minor incidents before they become fatal

Question 6

How do you minimise DCI?

Answer 6

Planning and managing dives using BSAC tables and waiting before doing a second dive also helps. Using NITROX does as well.

Question 7

What are the two main causes of bubble formation for DCI

Answer 7

Inadequate elimination of nitrogen during ascent

Lung damage from expanding gas during ascent

Question 8

What can happen to body tissues when you get air bubbles in them?

Answer 8

They can be damaged and forced out of shape by bubbles compressing nerves and causing pain and weakness.

Question 9

What are the two causes of lung damage relating to DCI

Answer 9

Holding breath

Going up too quickly

Question 10

What’s the earliest symptom of DCI?

Answer 10

Denial

Question 11

Signs of DCI

Answer 11

Rashes
Nausea
Denial
Headaches
Confusion
Shortness of breath
Unconsciousness

Question 12

Symptoms of DCI

Answer 12

Chest discomfort
Aches
Numbness
Tingling
 Trouble seeing
Dizziness

Question 13

Treatment for DCI

Answer 13

Recompression - it reduces the size of the bubbles in the body

Question 14

What to give to a person who has DCI

Answer 14

Oxygen and water

Question 15

When do you get nitrogen narcosis

Answer 15

When you go below 30m

Question 16

What does nitrogen narcosis do?

Answer 16

It affects transmission of impulses in the nerve cells

Question 17

Signs and symptoms of nitrogen narcosis

Answer 17

Anxiety

Feeling drunk

Question 18

Treatment for nitrogen narcosis

Answer 18

Ascending to shallower depth

Question 19

What does MOD mean

Answer 19

Maximum operating depth

Question 20

How does the amount of oxygen in the diving gas limit how far you can go down?

Answer 20

The more oxygen it has, the shallower you must go

Question 21

Signs and symptoms of oxygen toxicity

Answer 21

Visual disturbances 
Noise disturbances
Dizziness
Nausea
Twitching
Convulsions

Question 22

Treatment for oxygen toxicity

Answer 22

Don’t dive further that MOD for that gas

Abort dive

Question 23

What are bad fills caused by?

Answer 23

Poor maintenance and operation of compressors

Question 24

Two main problems causing bad fills

Answer 24

atmospheric contaminants drawn in

Compressors filters have become exhausted or faulty

Question 25

What things contaminate the gas and where are they found

Answer 25

Oil - used to lubricate
CO - caused by breakdown of oil
Water vapour - in atmosphere

Question 26

How to tell if you have a bad fill

Answer 26

Bad taste of gas

Bad smell

Dizziness

Sickness

Headache

Question 27

Causes of gas supply failure

Answer 27

Poor gas monitoring

Free flow

Equipment failure

Question 28

AS ascent meaning

Answer 28

Alternative supply ascent

Question 29

CBL rescue meaning

Answer 29

Controlled buoyant lift

Question 30

What should you do when doing a CBL to a person with convulsions? Why?

Answer 30

Wait until convulsions have stopped before lifting them as they may not be breathing and could have a collapsed lung when ascending