Wet Pot: Water Filled Hyperbaric Chamber


The “Wet Pot,” a term commonly used within the technical diving community, refers to a water-filled hyperbaric chamber. These chambers are integral to the fields of commercial and professional diving, aiding in processes like saturation diving and facilitating emergency treatment for divers who experience decompression sickness. Understanding the Wet Pot’s mechanism and application contributes to a comprehensive understanding of safe and effective diving practices.

Origins and Definition

The term “Wet Pot” emerged from the need to describe a hyperbaric chamber filled with a breathable medium—water. While conventional hyperbaric chambers are often filled with air or a gas mix, a Wet Pot is a specialized variant where the interior is filled with water. This design enhances the safety and efficiency of certain diving operations, particularly saturation diving, and is also used in some instances for therapeutic purposes.

Construction and Operation

A Wet Pot is a pressure-resistant container designed to mimic the pressure conditions divers experience under the sea. The internal environment of the Wet Pot is filled with water, often warmed to a comfortable temperature to alleviate the cold conditions divers would typically encounter at depth.

The Wet Pot’s construction allows for pressure manipulation within the chamber, simulating the conditions at varying underwater depths. Divers can be gradually acclimatized to different pressures, helping to prevent the rapid decompression that leads to decompression sickness. The Wet Pot usually includes an airlock to allow divers to enter and exit without disturbing the overall pressure environment.

Application in Saturation Diving

Wet Pots play a crucial role in saturation diving—a technique that allows divers to work at great depths for extended periods. Here, divers live in a pressurized environment between dives, typically an underwater habitat or a surface-decompression chamber, and are transported to the work site in a diving bell.

In a typical saturation diving operation, the Wet Pot is initially used for pre-dive saturation. Divers spend a controlled period in the Wet Pot, allowing their bodies to become saturated with inert gases at the intended depth’s pressure. Once saturation is achieved, the divers can work at that depth without the need for lengthy decompression stops during their ascent.

Therapeutic Applications

Beyond its utility in diving operations, the Wet Pot can also be used in hyperbaric oxygen therapy (HBOT) for treating decompression sickness (DCS), commonly known as ‘the bends.’ DCS is a potentially serious condition that can occur when a diver ascends too quickly, causing nitrogen bubbles to form in the tissues.

In HBOT, the diver is placed in the Wet Pot and subjected to high pressure, forcing the nitrogen bubbles to redissolve back into the bloodstream. The Wet Pot’s water environment can aid in heat regulation during long treatment sessions, offering comfort and minimizing the risk of hypothermia.

Safety and Operational Concerns

Like all diving equipment, Wet Pots require rigorous safety protocols. Operators must closely monitor pressure and temperature levels and maintain regular communication with divers inside. Divers must also be adequately trained in using the Wet Pot, including entering and exiting the chamber, coping with the effects of increased pressure, and emergency procedures.

Advanced Uses and Developments

In recent years, Wet Pots have been adapted to accommodate advancements in diving technology and practices. Newer models may include features for environmental control, superior communication systems, and integrated medical monitoring equipment. These advancements are designed to increase the safety and comfort of divers during both saturation periods and therapeutic treatments.

Additionally, Wet Pots are increasingly being used in scientific research related to human physiology under extreme conditions. By simulating deep-sea pressures, researchers can explore the human body’s response and adaptation mechanisms, thereby furthering our understanding of the limits and potentials of human endurance.

Training and Certification

As with all aspects of professional and technical diving, effective use of the Wet Pot requires proper training and certification. Divers must understand the basic physics of pressure changes, the physiology of gas absorption and elimination in the body, and the specific operational procedures related to the Wet Pot.

Training courses are offered by various diving certification agencies, focusing on both the theoretical knowledge and practical skills necessary to use Wet Pots safely and effectively. The training typically includes modules on handling emergencies, such as rapid pressure changes within the chamber, medical emergencies, and equipment malfunctions.

Maintenance and Inspection

Maintenance of Wet Pots is a crucial aspect of ensuring their safe and reliable operation. Regular inspection and maintenance schedules must be adhered to, including checking the integrity of the pressure vessel, inspecting the water heating system, and testing the functionality of the airlock and communication systems.

The interior of the Wet Pot should also be regularly cleaned and sanitized to prevent the buildup of bacteria or other harmful organisms. The water used in the Wet Pot must be of a suitable quality, often matching the standards for drinking water, to reduce the risk of contamination or infection.

Future Prospects

The future of Wet Pots in professional diving is likely to be shaped by technological advancements, improved safety standards, and increased understanding of human physiology under extreme conditions. As diving operations continue to push into deeper and more challenging environments, Wet Pots will remain an essential tool for ensuring divers’ safety and operational efficiency.

In conclusion, the Wet Pot, as a water-filled hyperbaric chamber, is an essential piece of equipment in advanced diving operations. By providing a controlled environment for acclimatizing divers to extreme pressures, facilitating therapeutic treatments for decompression sickness, and serving as a platform for research and training, Wet Pots contribute significantly to the advancement of diving practices and the expansion of human activities beneath the sea.


The Wet Pot, a water-filled hyperbaric chamber, serves as an essential tool in the professional and commercial diving industry. It allows for safe and efficient saturation diving, enabling divers to work at extreme depths for extended periods. Moreover, its use in treating decompression sickness further emphasizes its critical role in ensuring diver safety. As diving technology continues to advance, the Wet Pot remains a cornerstone of best practices in the field.