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...such as what Xdeep uses to make their flexible back-plates for their sidemount harnesses. Does anybody know how they make these or what material they use?

Another idea to just throw out there. Since you've already got the extra hardware why not learn to properly side-mount it with your other tank? That way you can go ahead and breath that extra 40 cubic feet (instead of just dragging dead weight around) while still having the redundancy. Assuming...

Title says it all really. I've been on the SDI and PADI websites but it seems to be mostly just chicken feeding.

Just include a CO gas analyser in your budget and test every tank. Problem solved. Or am I missing something?

Meanwhile... the Fukushima nuclear power plant is still leaking tons of radioactive water into the ocean. Has been doing so for 7years. But hey, let’s get worked up over some bloke riding a whale shark.

Apparently if you direct 100% O2 directly onto anything flamable (wood, oil etc) it'll self ignite. You could put that to the test for me? :eyebrow:

Agreed. If he was poaching I have no real sympathy.

Pretty sure the shark would have been more than capable of swimming off it was truly bothered? Divers aren't fast swimmers. Also, the biggest danger to this endangered species is international demand for their fins and liver oil. I'd much rather see people getting a kick out of interacting with...

Highest heat setting. Moved the iron at about 1cm/second. After the whole iron has moved over a section its probably had about 7-10 seconds maybe. I made a few hand sized bags to begin with to test it out. pumped them up and left them over night.

hmmm... I wonder if the material I used was easier to do a heat seal. I used Cortex600 which I thought was the same but possibly not? Or maybe I just got lucky with my sealing. Agree with the sewing. You can't see it in the picture but there is two rows of stitching around the edge of my one.

Thanks for linking that Tbone. Some well thought out systems there. His tank trim at the end was pretty terrible though.

Once you get the hang of it the heat method is actually quite easy. You don't need to hold the iron on its side and trace a line like Tigger has done. Just place the iron flat down and seal from the very edge in a cm or so (About half inch). Easy peasy.

Another great post. What thermal protection were you using?

Check out the 2017 BSAC incident report. It's full of lost weight incidents.

Fair point. I just finished reading through the 2017 BSAC Incident Report. Here are some cases which I though were relevant to this discussion. one case of lost weights from a BCD causing a uncontrolled buoyant ascent. one case of almost lost weight belt. Three case of lost weight belts...

But your already positively buoyant before you do anything. If you were at 10m when you had to ascend, your BCD is now twice as big as it was before. If your objective is to become more positive then I agree that dropping weights is a very quick method of achieving this. However it is not needed...

Why are people talking about OOG situations in this thread? You would have been neutral (or close to) before you ran out of air so as soon as you ascend you become positive. No reason to drop any weight in an OOG emergency. This is covered in the basic PADI course and is why we don't get taught...

I read that as he was diving ABOVE 180m so could have ended up very deep if he hadn’t ditched his weights.