delayed surface marker buoy

This Sealed SMB from AP Valves can be used as a delayed action deco-buoy or inflated prior to the dive and used as a dive duration SMB for drift dives, and is also useful as a distress flag which unlike normal open ended "sausage-style"…
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In very shallow water, here in 2.7m practicing skills will make any deeper dive DSMB deployment much easier. It's all about transfer of buoyancy. Thanks to Filip Coysman for videoing. Rating: 4.79
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