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I just got to Gordon Henderson's posting which described the delayed SMB

	In the UK, (and elsewhere, I guess!) you can buy specially designed
	delayed SMBs or decompression bouys. They are either a long tube, or
	"inverted pear" shaped devices, with the fittings for a small CO2
	cylinder or a small 0.2 litre air cylinder.

so the question in my last posting is answered.

They're certainly not available in Australia.  I don't think much use
is being made of lift bags and lines to handle ascents here in Sydney.
But then I'd say that the fraction of divers even using reels on wrecks 
is small, but growing.

The divers I know who are carrying lift bags for an ascent line are
not tethering to the wreck, and drifting to deco.

			Greg Ryan	gregr@cs*.su*.oz*.au*

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