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SEL Number: 01WA-05-TTHR
Title: Tether, Diving, Contaminated Water Operations


Last Updated: 3/11/2020 7:49:30 PM

Previous SEL Number: 01WA-05-TTHR

Description: Tether for use in contaminated water diving operations.

ImportantFeatures: For contaminated water diving operations, a diving tether is used with an ensemble that consists of a dry suit, dry suit gloves or mittens, dry suit boots or booties, dry suit underwear, and swimming fins. The ensemble is designed to maintain integrity of the breathing air supply, protect against chemical/biological contaminants, insulate against cold water, and protect against physical hazards. The diving tether must be designed to provide ample mobility while maintaining attachment to the wearer. The tether must be sufficiently strong to prevent breakage under strain or contact with physical hazards, but permit the diver to easily disconnect should entanglement hazards occur.

Operating Considerations: The principal hazard encountered during contaminated water diving is exposure to hazardous biological or chemical agents. While some contaminants may be so diluted that the associated risks are small, others such as PCBs may be immediately dangerous even at very low concentrations. Some materials may not dissolve in water; these chemicals could be encountered as pockets of highly concentrated material in bottom sediment or as slicks on the water's surface. Therefore, for maximum safety, the diver must be completely isolated from the water environment. Under certain conditions, when only a moderate biological hazard exists (such that only temporary illness could result), a lesser degree of protection may be sufficient. In general, because not all hazards may be apparent, the prudent decision is to use the equipment giving the highest level of protection. In the absence of specific standard on contaminated water diving protective clothing and equipment, U.S. Fire Administration Publication FA-136 is recommended.

Training Requirements: Core Training: Public Safety Diver with nationally-recognized dive certification. NFPA
National Fire Protection Association
1006, Chapter 13.
Initial Training: Extensive (> 2 days)
Sustainment Training: Extensive (> 2 days)

Mandatory Standards:

Applicable Standards and References:


MSSL:
  • Dive Team
  • Maritime
  • Preventive Rad/Nuc Detection