Rescue of a Submerged Unresponsive Diver

5 min read · 3 August 2026

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Recommendations for rescue of a submerged unresponsive compressed-gas diver is a 2012 publication by Mitchell and colleagues addressing the challenge of rescuing a diver who is unconscious underwater. The subject matters because a time-critical rescue must account for both the diver’s medical emergency and the hazards of bringing an incapacitated person to safety.

Why is an unresponsive diver underwater a distinct emergency?

An unresponsive diver cannot reliably protect their airway, control buoyancy, manage breathing equipment or assist with an ascent. A rescuer must therefore contend with a person who may be unable to cooperate while remaining exposed to the underwater environment.

Compressed-gas diving adds specific physiological and technical considerations. Ambient pressure affects gas volumes and the body’s interaction with breathing gas, while an ascent changes pressure rapidly; rescue planning must consider these effects alongside immediate threats such as loss of breathing support or airway protection.

What makes rescue medically and technically complex?

Rescue is not simply a matter of moving a diver upward. The rescuer may need to maintain contact, manage the diver’s equipment and buoyancy, and control the ascent, all while preserving their own ability to reach the surface safely.

Once out of the water, an unresponsive diver may need urgent assessment and resuscitation. The cause of collapse may not be apparent at the scene, and the possibility of pressure-related injury can affect subsequent medical evaluation and consideration of hyperbaric care.

Airway and breathing: an unconscious person may not keep the airway clear or breathe effectively.
Buoyancy and ascent: the diver may be unable to control depth or assist with a controlled ascent.
Rescuer safety: assisting another diver must not create a second casualty.
Post-rescue care: prompt medical assessment is important, including consideration of dive-related illness.

How does this topic fit into diving medicine?

Diving medicine addresses emergencies that begin in the water as well as their consequences after surfacing. Rescue of an unresponsive diver sits at the intersection of emergency response, respiratory and cardiovascular physiology, pressure-related illness, equipment use and operational safety.

Work on rescue procedures generally has to consider how clinical priorities translate into actions that are possible underwater. The central challenge is balancing the need to reach the surface promptly with the need to manage the diver and avoid an uncontrolled ascent or additional injury.

Who can use this publication’s subject matter?

Divers and rescue teams may find the subject relevant to emergency planning and training, while diving physicians and hyperbaric clinicians can use it as context for understanding how an underwater event shapes later assessment. Scientific divers also face the same basic need to plan for a team member who becomes unable to respond.

Procedures depend on the circumstances, equipment and training available. This discussion is general education, not a substitute for current training or an individual assessment; questions about a specific diver’s health or fitness to dive should be addressed with a diving-medicine physician.

Frequently asked questions

What does “compressed-gas diver” mean?

It refers to a diver breathing gas supplied under pressure, as in scuba diving. The surrounding pressure and changes in pressure during ascent are relevant to both rescue and medical assessment.

Why can’t an unresponsive diver simply be brought to the surface?

The diver may be unable to breathe effectively, protect the airway, manage equipment or control buoyancy. A rescue must also account for the rescuer’s safety and the risks of an uncontrolled ascent.

Who should assess a diver after an underwater loss of responsiveness?

An unresponsive diver needs urgent medical assessment. A diving-medicine physician should be consulted about dive-related concerns and fitness to return to diving.

Citation details

Title: Recommendations for rescue of a submerged unresponsive compressed-gas diver
Authors: Mitchell, SJ; Bennett, MH; Bird, N; Doolette, DJ; Hobbs, GW; Kay, E; Moon, RE; Neuman, TS; Vann, RD; Walker, R; Wyatt, HA
Year: 2012
Published in: Undersea & Hyperbaric Medicine 2012 Nov-Dec;39(6):1099-108
Identifiers: 1066-2936, PMID 23342767
Repository record: Rubicon Research Repository, handle 123456789/10161

This page is an original summary written by the Rubicon editors from the publication’s bibliographic record. It does not reproduce the paper, its abstract or its data; consult the publication itself for its methods and findings.