Hi, this doesn't apply in technical diving which is what we were conducting on these dives, up to a maximum depth on this project of 76m. For technical diving you used mix gas called trimix for the breathing gas which contains a high proportion of helium and a low proportion of oxygen and nitrogen. The purpose of this is to avoid the various toxic and narcotic inducing effects that these gases bring on at greater depth. Additional to the main breathing gas we carry extra cylinders on our sides of rich oxygen mixes such as 50% oxygen, 80% and 100% oxygen, we can't breathe these at depth as they would be toxic but we breathe them when we get back up to around 21m depth and less and in ascending. These 'deco' gases greatly accelerate our decompression time by flushing out the helium and nitrogen that had been saturated in our blood and tissues from the depth/pressure. However even with this form of technical diving then a dive of say 25 minutes to these depths would still require a gradual ascent and decompression stops, totalling an hour or more. All diver must have enough gas to get themselves and their colleagues out of trouble. The divers with rebreathers have a self regulating system that automatically feeds them the correct amount of oxygen for the dive and decompression based on their depth. Some divers and friends of ours will spend even longer at the bottom and deeper (only possible with the rebreather CCR units) where they might spend 40 minutes or more at the bottom giving them a total dive time to return to the surface of 4 hours or more.
@@zucchina24 Hi, yes it has to be very well organised, from anything to planning exact dive times to clearly labelling and signing each different gas mix to ensure no mistakes are made. The biggest risk in this type of diving is complacency and significant errors in gas mixes or buoyancy control can easily lead to death. However the training for this type of diving is very thorough, methodical and extensive and work through several stages from rudimental decompression diving to advanced technical diving and usually in stages over a period of time to allow you to build experience in between. The type of people who undertake this type of diving are usually drawn to the more pragmatic, regimental and scientific approach to the skills required.
An excellent full length programme - can recommend !
Thank you!
He's expanding his reach 🙏🏿💪🏿
Hi Karl. I downloaded this video on your recommendation and thought it was just fantastic. I really enjoyed it. Congratulations to you and the team.
Thank you for that and glad to hear you enjoyed it.
Now, this looks fascinating. Definitely watching this!
Hope you enjoy it!
If I had to guess... Karl did the lighting on the interview parts?
👏🏻👏🏻👏🏻
How does the '120' rule apply to mixed gases. She is in 70 metres of water. Just asking.
Hi, this doesn't apply in technical diving which is what we were conducting on these dives, up to a maximum depth on this project of 76m. For technical diving you used mix gas called trimix for the breathing gas which contains a high proportion of helium and a low proportion of oxygen and nitrogen. The purpose of this is to avoid the various toxic and narcotic inducing effects that these gases bring on at greater depth. Additional to the main breathing gas we carry extra cylinders on our sides of rich oxygen mixes such as 50% oxygen, 80% and 100% oxygen, we can't breathe these at depth as they would be toxic but we breathe them when we get back up to around 21m depth and less and in ascending. These 'deco' gases greatly accelerate our decompression time by flushing out the helium and nitrogen that had been saturated in our blood and tissues from the depth/pressure. However even with this form of technical diving then a dive of say 25 minutes to these depths would still require a gradual ascent and decompression stops, totalling an hour or more. All diver must have enough gas to get themselves and their colleagues out of trouble. The divers with rebreathers have a self regulating system that automatically feeds them the correct amount of oxygen for the dive and decompression based on their depth. Some divers and friends of ours will spend even longer at the bottom and deeper (only possible with the rebreather CCR units) where they might spend 40 minutes or more at the bottom giving them a total dive time to return to the surface of 4 hours or more.
@@VisualEducationStudio Many thanks indeed Karl
@@VisualEducationStudioimpressive! 😮 must be a really well organised operation!
@@zucchina24 Hi, yes it has to be very well organised, from anything to planning exact dive times to clearly labelling and signing each different gas mix to ensure no mistakes are made. The biggest risk in this type of diving is complacency and significant errors in gas mixes or buoyancy control can easily lead to death. However the training for this type of diving is very thorough, methodical and extensive and work through several stages from rudimental decompression diving to advanced technical diving and usually in stages over a period of time to allow you to build experience in between. The type of people who undertake this type of diving are usually drawn to the more pragmatic, regimental and scientific approach to the skills required.