@Dave Kay a DM is a "dive master". This is someone who assists in training and can guide dives. Most of the time on internet forums DM is used synonymously with "dive guide" although the role of a DM can be much broader.
A DSMB is an inflatable tube that can be inflated at depth as a "marker". DSMB stands for 'Delayed (or deployable) Surface Marker Buoy". Many divers call them a "blob" or a "safety sausage" (see picture).
A DSMB is an inflatable tube that can be inflated at depth as a "marker". DSMB stands for 'Delayed (or deployable) Surface Marker Buoy". Many divers call them a "blob" or a "safety sausage" (see picture).
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