Diver wearing a diving helmet is sanding a repair patch on a submarine
A diver at work on hull maintenance

Ships husbandry or ship husbandry is all aspects of maintenance, cleaning,[1] and general upkeep of the hull, rigging, and equipment of a ship. It may also be used to refer to aspects of maintenance which are not specifically covered by the technical departments.[2] The term is used in both naval and merchant shipping,[3] but naval vessel husbandry may also be used for specific reference to naval vessels.[4]


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Ships husbandry diving

Underwater ships husbandry can be financially advantageous when it eliminates the need for dry-dock repairs or extends the interval between dry-dockings, and reduces the time a ship is required to stay in dry-dock.[5]

Underwater ship husbandry includes the following operations, usually done by commercial divers, though some can be done by ROVs or robotic machinery:

Environmental impact

Several of the operations classified as ship husbandry will release some quantity of harmful material into the water, particularly hull cleaning operations which will release antifouling toxins.[6] Underwater ship husbandry can cause an adverse environmental effect as significant amounts of copper and zinc are released by underwater hull scrubbing. Alien biofouling organisms may also be released during this process.[6]: 15 

Diving under the hull

The underside of the hull is an overhead environment with no direct vertical access to the surface. As such it constitutes an entrapment hazard, particularly under large vessels where it may be too dark due to low natural light or turbid water to see the way to the side of the hull. The bottom of the largest ships is mostly flat and featureless, exacerbating the problem. Only surface-supplied diving is authorised for this work in most jurisdictions, as this not only secures the diver's breathing gas supply, but also provides a guideline to the exit point. The use of mechanised bottom scrubbing devices which are steered along the hull surface by a diver and scrub it with rotary brushes has been linked with high release of environmental toxins. There is also a hazard of crushing if the clearance is small and the tide range is large.


  1. ^ Nelson, Mark. "Ship's Husbandry". Jackspeak of the Royal Canadian Navy. ReadyAyeReady.com. Retrieved 19 March 2017.
  2. ^ Staff. "1: Hull Maintenance". Ship Husbandry (PDF). Royal Australian Navy Apprentice Training Establishment.
  3. ^ Jensen, Milinda D. (3 March 2004). "Underwater Ship Husbandry Combines Navy, Civilian Divers into Successful Team". Story Number: NNS040303-02. Naval Sea Systems Command Public Affairs. Retrieved 19 March 2017.
  4. ^ Staff (2014). "Naval Vessel Husbandry". Strategy Logistics. Retrieved 19 March 2017.
  5. ^ Staff. "Underwater Ship Husbandry". SUPSALV. Washington, DC: Naval Sea Systems Command. Retrieved 17 March 2017.
  6. ^ a b c d e f g h "Underwater Ship Husbandry: Nature of Discharge (EPA-842-R-99-001.)" (PDF). Phase I Final Rule and Technical Development Document of Uniform National Discharge Standards. United States Environmental Protection Agency. April 1999. Retrieved 19 March 2017.