The Depth Charger - Marker Buoy Deployment System

What is the maximum depth a submarine can operate at before damaging its hull or engine? - Quora

SPM (Single Point Mooring) or SBM Operations

Anchoring—Chain: Stoppers, Termination and Marking - Attainable Adventure Cruising

DiveSafe Delayed Surface Marker Buoy - 6ft Open Bottom with Over Pressure Valve, High Visibility Reflective Band, Strobe Light or Flashlight Holder, 100ft ABS Finger Reel and Whistle : Sports

Sensors, Free Full-Text

Dive Safely in Crowded Areas or Signal Your Boat Team - A safety sausage is necessary gear for every scuba diver, whether it's to avoid crowded

DiveSafe Delayed Surface Marker Buoy - 6ft Open Bottom with Over Pressure Valve, High Visibility Reflective Band, Strobe Light or Flashlight Holder

Buoy - Wikipedia

Offshore Persistent Monitoring

Marker buoys are still a thing