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somebody opened an innocent looking can and now there's worms everywhere:facepalm: I have understood that the oxygen consumption is about the same regardless of the ambient pressure. and the partial pressure able to support life is the same regardless of ambient pressure. Oxygen consumption is...

Yes you are because you are assuming that the couple of bars of extra nitrogen would magically disappear from the lungs if you just swim around for a minute before ascending. of course it can be tested for sure. anyone attempting would end up in hospital or worse. silly indeed but rather...

you are assuming the scuba air breathed would contain 100% oxygen which it is NOT. we call it dangerous practice leading to a lung overexpansion injury (the nitrogen goes nowhere and expands fully normally when ascending)

Dangerous stuff teached here. Of course we are complaining especially on this type of forum where someone might take the given advice seriously and would hurt or kill him/herself following the advice.

I really hope the freediver would exhale during the ascent because his lungs would explode to little pieces if he would breath hold the scuba breath from that depth. He would probably be HAPPY to black out at that point I believe o_O exhaling on scuba ascent is for letting out the expanding air...

in tissues not airspace

as I understood it he was talking about maintaining the life supporting level of oxygen partial pressure by increasing ambient pressure in relation to the fading oxygen levels in tissues?

I understand what you mean but it gets very confusing and brain hurting if not using the correct terms all the way. You really should use the partial pressure term to make the posts more understandable

yes miles are used there. Was pretty shocked when it turned out on the road when walking with all our bags etc. that the hotel was NOT within walking distance because we thought the sign indicated kilometers but it was actually miles and the distance was, ehm, a little bit longer than expected...

Gases dissolve from high partial pressure to low partial pressure trying to create an equilibrium where the partial pressures are the same. This is also how the lungs work: the oxygen goes from higher partial pressure to lower partial pressure (normally from air in alveoli to the bloodstream)...

the oxygen transport is explained very well in literature including some scuba books. For example the Deco for Divers by Mark Powell. hemoglobin carries most of the oxygen transport in bloodstream and only couple of % is carried in blood plasma whereas almost all nitrogen is carried in plasma...

Yep I would not let the freediver take a breath and then let go of the octo and surface. Too much risk of breathholding and serious injuries and no way knowing if they understand anything about compressed air diving. This is where a long hose setup becomes handy... They cannot grab your octo by...

It would be easiest to clear the regulator using the purge button if deep enough that air in freedivers lungs is compressed extensively. It would be safest to take couple of breaths and then make a normal controlled scuba ascent WITH the scuba diver and breathing continuosly from the regulator...

Are you used to snorkeling /done it a lot? for me it helped to have lots of snorkeling experience before switching to scuba. the feeling being able to breathe underwater was pretty similar and it was extremely easy to adjust to the regulator after that. the basic fin pivot technique helps both...

as bmorescuba said Davinci Resolve has a free version available which is great for editing and colour corrections. takes some time to learn compared to Movie Maker type programs but not complicated by my opinion and there is lots of tutorials available. needs some gpu power from the computer...

If one is having serious buoyancy problems or runs out of air at depth and needs to do CESA or buoyant ascent by dropping weights, then it is very easy for a vacation diver to get into Polaris style super aggressive profiles getting almost into deco and then shooting up to the surface fast...

those mark powell books. The Darkness Beckons , Martyn Farr Essentials of Cave Diving, Jill Heinerth

ok a small cavern then. still not good to get to overhead environment at that point in your diving career

by "cave" you really mean a cave or cavern type of overhead environment? and you got to deco in that? :shocked::shocked: if true it sounds like the instructor was breaching major safety standards there. most of the more experienced guys here would not want to venture to a cave and end up in...

when completely new to diving I tended to just use the same weighting I had in the ow course (maybe 3 kg too much or more) and I always struggled and made lots of depth bomb descends where I had to worry about my ears all the time. with proper weighting it is much easier and as said the...