All divers should carry a delayed surface marker buoy (DSMB) when diving in the ocean or a large body of water. If they need to signal their location to the shore or a boat, the DSMB is a highly visible marker that they can deploy underwater or at the surface. Learn how to deploy a DSMB underwater.
If you want to learn more about scuba diving safely, join the SSI Diver Stress and Rescue Specialty program and learn how to help and protect yourself and other divers.
Learn more here:
https://www.divessi.com/en/advanced-training/scuba-diving/diver-stress-rescue
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