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So... The open bottom, no OPV (except the open bottom) sausage I routinely shoot from my safety stop on boat dives isn't a deployable Surface Marker Buoy?A DSMB - as distinct from a SMB - by definition will have an OPV and so can be dumped with ascent to provide control.
I beg to differ. And so does the manufacturer of said sausage.
And to the OP: having redundant buoyancy is one of the many advantages of diving a drysuit in cold water. So in the unlikely case of a wing failure I'd return to using my DS for buoyancy.