Having just booked another trip to Marsa Alam in the Red Sea, and getting impatient to get diving again and away from the cold. I thought I’d do a few …… (or it may end up as just the one, depending if I get bored with writing about it and not doing it!
First let me introduce myself, You know my name so I’ll dispense with that bit, I am a PADI Instructor (Master Scuba Diver Trainer) and am qualified to teach from open water (what is now called “doing your PADI”) to Divemaster, plus Deep, Night, Wreck, Drift, Navigation and Dry suit, specialities. I have a bunch of other qualifications including Nitrox to 40%(enriched air) shark, boat, master scuba diver and equipment specialist, also Emergency first response, Advanced Oxygen first aid provider . To become an instructor I have to have good knowledge of, Physics and physiology, first aid (in diving) diving equipment, and recreational dive planning (even though most people dive with computers, these days)
Weightbelt removal and replacement, teaching children is dead easy, they have no fear, and and pick up things really quickly, what they do have is boundless energy, and I remember being more exhausted after 2 hours in the pool with this 10 year old, than with a whole group of adults!
One of the smaller people I’ve taught!
Both 6’3” me in the middle 5’3”
It can be quite funny teaching dry suit diving……
A dry suit is what it says, it should not contain water, I say should not, because not all suits manage to keep out the ocean, all the time and that trickle of ice cold water down your warm back is something to remember! It has a very heavy duty zip,and wrist and neck seals, ( and bearing in mind the water temp when using a dry suit could be around freezing ) Insulation in a dry suit, is warm undersuits and air.
A wet suit is what it says too, Wet, it works because a thin layer of water is trapped between your skin and the neoprene. Your body heats up that layer, the neoprene insulates the layer, from the colder water outside.
(James Bond….. could not have unzipped his wetsuit, and had a pristine tux underneath.)
Now diving in a dry suit is slightly different from in a wet suit, because the dry sit contains air, which is buoyant, and travels at will around the suit, the trick is to keep the air where it should be. In the body, once it travels to the feet you’re in trouble, which I’ll teach you to get out of but in the meantime is hilarious to watch! I wish I had a picture of this guy 6’3” hanging upside down, feet sticking out of the water, thrashing about attempting to right himself.
It’s also dangerous, at 30metres (90ft) (or deeper) and can lead to an uncontrolled ascent, with no way to vent air, and a trip to the chamber! (if your lucky!)
A few facts…….
If you cut your self at 20mtrs (65+ft), your blood, will appear to be a greeny/brown colour, and will stay in a globule close to the cut!
Break an uncooked egg at 25mtrs and for about five minutes it will stay in the exact shape of an egg (after 5 minutes the fish would have eaten it!)
Colour (light) is absorbed by water, Red or orange in the short wave lengths disappear first, the longer, wavelengths blue, go last, (which is why my fins are luminous green, if ever one comes off, I can see it, as it descends, to the bottom of the sea, and watch it sit there unreachable!)
Oxygen becomes toxic at depth, (around 6mtrs /20ft) Air at around 70mtrs (affecting the central nervous system CNS) not recommended to go this deep, as each person’s body tissue, absorbs gas differently under pressure
My deepest dive on Air was 52mtrs (170ft) on the Numidia, a Red Sea wreck
Nitrogen Narcosis, happens at around 20mtrs, depending on the amount dived, may not happen at all!
All taken at the Lundy Isles,