What Happens If Flashcards
Who has responsibility for diving operations
Dive manager
What does the dive leader do?
Responsibility for the execution of dive plan underwater
What is an SMB
Surface marker buoy
What can an SMB be used for?
Signalling device to the boat and also keeps buddy pair together
What is the incidence pit?
Resolve minor incidents before they become fatal
How do you minimise DCI?
Planning and managing dives using BSAC tables and waiting before doing a second dive also helps. Using NITROX does as well.
What are the two main causes of bubble formation for DCI
Inadequate elimination of nitrogen during ascent
Lung damage from expanding gas during ascent
What can happen to body tissues when you get air bubbles in them?
They can be damaged and forced out of shape by bubbles compressing nerves and causing pain and weakness.
What are the two causes of lung damage relating to DCI
Holding breath
Going up too quickly
What’s the earliest symptom of DCI?
Denial
Signs of DCI
Rashes Nausea Denial Headaches Confusion Shortness of breath Unconsciousness
Symptoms of DCI
Chest discomfort Aches Numbness Tingling Trouble seeing Dizziness
Treatment for DCI
Recompression - it reduces the size of the bubbles in the body
What to give to a person who has DCI
Oxygen and water
When do you get nitrogen narcosis
When you go below 30m
What does nitrogen narcosis do?
It affects transmission of impulses in the nerve cells
Signs and symptoms of nitrogen narcosis
Anxiety
Feeling drunk
Treatment for nitrogen narcosis
Ascending to shallower depth
What does MOD mean
Maximum operating depth
How does the amount of oxygen in the diving gas limit how far you can go down?
The more oxygen it has, the shallower you must go
Signs and symptoms of oxygen toxicity
Visual disturbances Noise disturbances Dizziness Nausea Twitching Convulsions
Treatment for oxygen toxicity
Don’t dive further that MOD for that gas
Abort dive
What are bad fills caused by?
Poor maintenance and operation of compressors
Two main problems causing bad fills
atmospheric contaminants drawn in
Compressors filters have become exhausted or faulty
