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i was told there are special rules for commercial paua (abalone) divers in that area - due to the number of great whites they allow the paua take to be done on scuba so to minimise time in the water -normally it has to be done free diving. I dived with a guy a few year ago that told me the...

i think you ve got it back to front -an understanding of the geology of the cave is valuable but it doest replace cogent navigational aids this was what was written- "My personal opinion is you should pretty much be able to memorize all your navigation choices and times" other comments in this...

yeah you need to practice those upside down tricks - youll use them all the time

depends on your long term plans and finances - 4 options you can get a lighter / mid range garment and add layers - merino etc get a good one and stay warm but bake in the summer ( Halo ) get more than one under garment ( preferred option )

do a search - plenty of discussin on this https://scubaboard.com/community/threads/advice-on-tdi-advanced-nitrox-and-deco-procedures-training.501535/ if you can hold your position in column of water while shooting an SMB and moving tanks form one side to the other then youll be fine get your...

Thank you for your comments and clarifying context - i completely agree here - correctly marking all navigational decisions is foundational - it has been demonstrated ad infinitum that human memory recall is flawed and even more so under stress situations

I think thats a poor analogy -if you miss a turn and get lost you can pull over and use a map ( big clue there) - getting lost underwater and running out of air and getting lost in a city and running out of petrol aren't the same so do you keep repeating the same dive until you have it...

are you telling me that you can recall say, 4-5 jumps and 8 T's on a dive ? even under stress?

Found human remains in 3 locations- arm bone WW2 wreck - femur WW2 wreck - full skeleton in a cave found a tray of eggs at 36 m on wreck sank 35 years previous, the shells were generally intact. Saw a documentary on a ship that sank - one of the staff was lamenting losing her favourite...

do you mean as well as dropping cookies? if the cave already has a map i just write down on a wrist slate my plan and then the second diver does the same -then one of us reads out the plan and checks see eg

correct yes -however things change if no prior knowledge is available - it may be siltier or tighter than expected and it could be 4m or 14m long -its different not knowing whats ahead when your second can see nothing and success or failure can be being too far left or right and you need to be...

Just to clarify im referring to a silt out where theres no physical contact - the lead diver has gone through a long restriction and got through to some space and is waiting yes that is what eventuated - the problem fro the lead diver was not knowing if the second was coming through or maybe...

something that would be useful in planning is to have a visual display of N loading/deco obligations and CNS and then adjust the gas mixes to see how that changes the outcomes - this may be already in subsurface - i dont know you can do this jus try resetting values in an app but a side by...

send pics

lets face it, the bar is pretty low to become a DM or instructor. At the same time the bar is also pretty low to achieve an AOW cert. (in general agency standards I get the impression GUE standards may be higher) The business model is get more people diving and generate income by numbers but...

sorry didnt mean to direct that to you - just following on tursiops view of nitrogen decreasing rather than oxygen increasing veiw point - ive found explaining it to others in those terms is easier to understand

what are the physics allowing you to have longer bottom times

some sort of signalling was discussed after the first 2 divers got back and debriefed - i teamed up with one of them on the second day and went back to have another go - the plan was indeed after 10 min head back solo regardless of which side of the restriction we were on, (that takes a bit...

what happened to the diver in the lead - did they exit somewhere?

thats because he was in disguise