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Underwater Kinetics
This was asked of me at a recent beach diving get together. I believe this is important to be aware of overexpansion lung injuries (from an uncontrolled ascent) and secondary pulmonary embolism (air in the bloodstream from insulted lung tissue).
Lung over-expansion injury occurs when a SCUBA Diver holds their breath when ascending underwater. This can be as little as a 1.5 meter ascent near the surface.
How it happens (The technical reason)
When using SCUBA equipment underwater, the diver is breathing compressed air at a pressure equal to that of the water around him/her. This means the air entering their lungs is at the same pressure as the water. When the diver ascends, according to Boyle's Law, the air expands due to reducing hydrostatic pressure, (the shallower the depth, the less the pressure) causing the lungs to over-inflate.
The lung does not burst like a balloon when over-inflated, instead it tears. However the tear itself is not so much a problem as the resulting air entering the tissues and bloodstream. The result of such a rupture causes the pulmonary capillaries and alveoli to rupture mixing blood and air into the lungs usually causing the diver to cough up blood. (A definite alert sign) The rupture can also cause one of four injuries: Air embolism, pneumothorax, mediastinal emphysema, and subcutaneous emphysema.
Why it happens (The human factor)
The most common causes of lung over-expansion injury are panic and ignorance. Other less common causes are choking, nausea, carelessness, and even smoking. Smoking can destroy the surfactant which keeps the lungs from sticking shut when they are vented. This can cause the parts of the lungs to stick shut and simulate holding ones breath.
How to avoid
 Never hold your breath while using SCUBA equipment.
- Never give a "puff" of air to a free diver when using SCUBA equipment underwater. The free diver may not be aware of the problem of lung over-expansion injury and ascend without releasing their breath.
- Avoid diving while having chest congestion problems (eg colds, flu's, etc).
- Smokers should not smoke for several hours before a dive. (Good luck convincing them of that! So do NOT dive if you are a heavy smoker and have had a cold or flu recently).
- See a diving-aware doctor before learning to dive, and if you have any injury to your lungs or chest, see the doctor again.
What to do
The most common, and biggest warning sign of a lung over-expansion injury is coughing up blood. Other indications include chest pains and difficulty breathing. If you suspect such an injury immediately consult an emergency medical specialist.If you want to know the nitty gritty more, please ping me at a local dive get together. All that medical school needs to be used somehow!
Tevis
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Tevis
diving lights?
im looking for a light to go diving within the 25-55 dollar range. should i get a wide or narrow beam? i was looking at the underwater kinetics sl6 xenon and it looks good, but is it too narrow for a night dive? i wont need it during the day the visibility is supposed to be 70-100 feet, but what do you think?
You get what you pay for. 55 bucks is pretty cheap for a decent dive light. I'd call that my secondary light.. The one I'd pull out if I had no other choice.
A good light will set you back about 120 bucks. A really good one will set you back over a grand for a HID. Go big or don't do the night dive. What you're proposing is a back up light, not a primary. and by the way...you need both. They do tend to teach that in the night diver speciality.
I carry 3 for my wreck dives or nights and yes...once it all came down to that "cheap"60 dollar pencil beam when both my primaries failed due to a short.
Wetsuit Wearhouse Product Video - Hangair Wetsuit Drying System
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 Underwater Kinetics UK Mini Q40 eLED Diving Light Yellow, NEW  US $29.99
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 Underwater Kinetics SL4 eLED Light UK80121 US $69.75
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 Titanium Remora Scuba Knife full kit, Underwater Kinetics US $28.00
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 Blue Tang Titanium Blunt Tip Dive Knife NIB Underwater Kinetics blk/yellow US $69.99
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 TUNDRA UNDERWATER KINETICS WATER TIGHT CASE US $19.95
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 Tundra Camera Case/ Underwater Kinetics US $67.99
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 Dive Light, Underwater Kinetics UK400, takes 4D batteries US $20.00
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 Underwater Kinetics..4AA-AS2 Xenon Light w/batteries US $12.99
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 underwater kinetics light US $6.99
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 Underwater Kinetics 716 UltraCase hard case US $27.99
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 Underwater Kinetics Mini Q40 Dive Flashlight US $19.99
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 TUNDRA Underwater Kinetics model 518 camera case w shoulder strap US $49.99
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 Underwater Kinetics 19904 Replacement Light Bulbs 4 Pieces US $14.99
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 Underwater Kinetics UK300 Replacement Light 4 Pieces US $14.99
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 NEW UNDERWATER KINETICS LIGHT CANNON 100 HID DIVE LIGHT US $229.99
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 Underwater Kinetics SL6 Sun light US $10.00
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 Underwater Kinetics 821 STORAGE SHIPPING DRY ULTRA CASE used US $74.99
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 New Underwater kinetics eled light cannon 825lumens US $200.00
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 Underwater Kinetics Blue Tang Dive Knife US $30.00
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 UK UNDERWATER KINETICS SUPER Q eLED RECHARGABLE LIGHT US $89.00
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 UK Underwater Kinetics C8 Dive Light US $35.00
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 Underwater Kinetics Blunt Tip Hydralloy Dive Knife US $63.76
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 Underwater Kinetics 716 Dry Case With Foam NIB US $59.99
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 Underwater Kinetics Super Q eLED Rechargeable Flashlight UK12201 US $79.75
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 Underwater Kinetics eLED Light Cannon - Black US $205.99
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 Underwater Kinetics UK 4AA Mini Q40 eLed Plus NEW US $41.00
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 Underwater Kinetics HangAir Hanger (US Case/ Box Accessories US $46.99
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 Underwater Kinetics Mini Q40 Light Yellow #14080 US $24.95
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 Underwater Kinetics Mini Q40 Light Black #14078 US $24.95
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 HOSE PROTECTORS / Underwater Kinetics / BLUE US $3.50
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 Underwater Kinetics Remora Dive Knife - Black US $61.99
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 Underwater Kinetics Dive Light - Sunlight 4 C-Cell, Yel US $51.71
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Underwater Kinetics Mini Q40 Xenon Flashlight
UK - Underwater Kinetics Mini Q40 - The high intensity Mini Q40 is lightweight enough to attach to your mask strap for hands free illumination of gauges and close-up marine life. It outshines many lights three times its size.... |
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Underwater Kinetics 3AAA Vizion eLED Headlamp
Energy conservation design transfers heat back into batteries for longer burn time and improved cold weather performance, High Impact ABS, LEXAN, polyurethane rubber, and stainless steel construction for durability... |
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BluSens GDT-001012 Waterproof LED Magna Flashlight
$1.89 Just shake this Blu Sens GDT-001012 Waterproof LED Magna Shake Flashlight to generate power. Power generated by magnet passing through copper coil. Ideal for home, auto, boat, outdoor and emergency use. The capacitor can be charged over 100,000 times and it can operate in extremely hot or cold conditions, as well. It's waterproof and floats in water.... |
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Fascinations Nature's Fire Interactive Sculpture
$20.00 The forces of earth, fire and water create an amazing kinetic sculpture. Emulates the action of an erupting volcanoChanging light patterns with multi-colored effectsMesmerizing visual displayIncludes motion beads and multi-colored LED lightsFully sealed and enclosed – no leakage1-year limited manufacturer's warrantyUnderwriters Laboratories (UL) Approved. UL is the worldwide trusted source f... |
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Mini Undersea Volcano Eruption Lamp
A wonderful desk top toy or a nightlight, this is a perfect gift for almost anyone, and reasonably priced also! This mini undersea volcano lamp will enhance any room decor with its soothing, elegant ambiance. Everyone who sees it is mesmerized and thinks it is super cool. The dynamics of bringing earth, fire and water together are reflected in this amazing, miniature kinetic sculpture. Experien... |
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UK NiCad Battery Pack for C8 eLED, Light Cannon 100, AquaSun
$57.66 UK NiCad Battery Pack for C8 eLED, Light Cannon 100, AquaSun... |
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Underwater Kinetics Replacement Bulb for Mini Pocket Lite
$9.99 You just got suited up for a night dive in St Somewhere you check you're Mini Pocket Lite and you discover the bulb is burned out! Pre-dive equipment preparations are serious business. Missing or broken equipment can ruin an otherwise perfectly planned dive. Just keep a spare bulb in your dive bag. This is definitely one of those items that you want to never need, but want to have on hand in case ... |
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2AA, AS1, Switched, Black (UK15002) Category: Miscellaneous Flashlights
$22.20 Item #: UK15002. This fully accessorized work light can be mounted on a hard hat or fire helmet, carried in a belt pouch or used to direct traffic. Non-corroding ABS and polycarbonate plastic construction. Rubber sheath molded over bezel to reduce glare. Push-button thumb. This fully accessorized work light can be mounted on a hard hat or fire helmet, carried in a belt pouch or used to direct traf... |
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Underwater Kinetics Replacement Xenon Bulb
$14.94 Underwater Kinetics Replacement Xenon Bulb serves as a replacement for the Sunlight C4 Xenon Dive Light.... |
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Underwater Kinetics 416 Dry Case without Foam - Orange
$96.99 Outside or indoors, delicate equipment must be protected when not in use from crushing, moisture, dust, corrosive gasses, vibration, UV light, theft, etc. The tough Ultra Case® all environmental protection containers' shell will surround and cradle your precious gear from these elements and more so that it is ready for the next time you need it. Tough injection molded o-ring sealed carrying case ... |
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