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Sten Meyer's comments on 300 bar steel tanks were most probably correct. Aga tanks have been used both for smoke diving and water diving, and it is in smoke diving that the weight is all-important, as the work is incredibly exthausting. What comes to different makes, I haven't experienced any difference between Aga/Interspiro or Heiser 6-litre tanks. On the other hand, the old Aga 7-litre tanks are considerably heavier than 6-litre ones. The difference is at least 2 kilos of lead on/off the belt. But as there is not enough gas (at least according to thirds rule) in 300 bar double 6's for deeper dives (below 40-45 m), We mostly dive with double 10 litre 200 bar tanks anyhow. I don't believe in carbon fibre tanks for Your normal diving either, but I'm sure Rodel was looking for tanks to use on cave diving trips in the Alps, where You have to hump all Your gear up and down the mountains. Mere thought of humping old aga double 7's anywhere in excess of 20 metres makes me tired! That's about all I have to say about 300 bar tanks. Execept that the valve configuration is often such (Aga/Interspiro, Heiser) that You can attach only one first stage. Equipment redundancy becomes a problem. But then again one is always able to rig up different manifold arrangements. Merry Xmas to You all, Juha
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