TDI Advanced nitrox

Question 1

Describe tech mindset main goal

Answer 1

Mission oriented

Question 2

aspects of being a TDI diver

Answer 2

Things do not happen by accident
Aware of impact 360
Control without thinking about it

Question 3

skills to refine

Answer 3

Buoyancy
Swimming
Trim
Breathing

Question 4

Hallmark of elite diver

Answer 4

Buoyancy

Question 5

Best way to move through water

Answer 5

Horizontal with slight arch in back

Bend in legs

Question 6

Describe ideal breathing

Answer 6

Breathe from diaphragm
Pot belly
Then expand chest
Breathe out slowly tongue on roof of mouth

Question 7

2 advantages of ideal breathing

Answer 7

Control buoyancy

Use less air

Question 8

2 reasons to deviate from ideal breathing

Answer 8

Maintain tight hover

Slow down a descent by breathing top of lungs

Question 9

2 things Boyle’s Law can calculate

Answer 9

Pressure at depth

Volume of gas consumed

Question 10

Dalton’s law calculates…

Answer 10

Ideal mix
Partial pressure
MOD

Question 11

Define hypoxia

Answer 11

Breathing gas less than .21 O2

Question 12

What levels of O2 are dangerous?

Fatal?

Answer 12

0. 16 dangerous

0. 12 fatal

Question 13

What is breathing O2 > .21pp called

Answer 13

Hyperoxia

Question 14

What pp O2 do you have to track O2 exposure?

Answer 14

.5 ata

Question 15

Symptoms of pulmonary oxygen toxicity

Answer 15

Difficulty breathing
Pain on inhaling
Dry cough
Sore lungs/throat

Question 16

Signs of CNS O2 toxicity

Answer 16

ConVENTID

Convulsion
Visual disturbances
Ear ringing
Nausea
Twitching tingling in face or fingers
Irritability 
Dizziness

Question 17

How to manage decompression risk

Answer 17

O2 training
Ensure o2 available
Diving insurance 
Continue rescue training
Plan for deco incidents

Question 18

3 factors that influence narcosis

Answer 18

Exposure over 4.0 of N2
Environment eg Overhead Cold and dark
Diver performance

Question 19

CO2 rises complicate…

Answer 19

Breathing - air starvation leads to panic
Narcosis
Deco and O2 toxicity risk

Question 20

O2 percentage that requires cleaning

Answer 20

40%

Question 21

3 things to do before breathing gas mix

Answer 21

Analyse
Label
Log

Question 22

START checklist

Answer 22

S Drill out of air
Team buddy equipment checks
Air gas matching 
Route - entry exit
Tables - depth duration waypoint schedule

Question 23

Describe partial pressure blending

Answer 23

Add O2 then top up with air

Slow labour intensive most common

Question 24

Describe continuous blending

Answer 24

Nitrox pre blended before being compressed

Question 25

Describe membrane blending

Answer 25

Membrane removes required % of nitrogen from air

Question 26

5 things that should be planned before any dive

Answer 26

Gas requirements
O2 limits
Nitrogen limits
Strategy for tracking dive
Thermal considerations

Question 27

3 reasons gas supply calculations are important

Answer 27

Know how much needed for dive and safety margin
Running out of gas on a tech dive can injure/kill
Rebreathers for bailout needs

Question 28

What is RMV and how to calculate

Answer 28

Respiratory minute volume

Bars breathed x capacity of cylinder/depth pressure (bars)/mins