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  2. Dry dock - Wikipedia

    en.wikipedia.org/wiki/Dry_dock

    A floating dry dock is a type of pontoon for dry docking ships, possessing floodable buoyancy chambers and a U-shaped cross-section. The walls are used to give the dry dock stability when the floor or deck is below the surface of the water. When valves are opened, the chambers fill with water, causing the dry dock to float lower in the water ...

  3. Fishing techniques - Wikipedia

    en.wikipedia.org/wiki/Fishing_techniques

    Some fishing spears use slings (or rubber loops) to propel the spear. A Hupa man with his spear. Bowfishing - uses a bow and arrow to kill fish in shallow water from above. Gigging - uses small trident type spears with long handles for gigging bullfrogs with a bright light at night, or for gigging suckers and other rough fish in shallow water.

  4. Marine salvage - Wikipedia

    en.wikipedia.org/wiki/Marine_salvage

    Types USS Regulus hard aground in 1971 due to a typhoon: after three weeks of effort, Naval salvors deemed it unsalvageable.. Marine salvage takes many forms, and may involve anything from refloating a ship that has gone aground or sunk as well as necessary work to prevent loss of the vessel, such as pumping water out of a ship—thereby keeping the ship afloat—extinguishing fires on board ...

  5. Holderness Drain - Wikipedia

    en.wikipedia.org/wiki/Holderness_Drain

    In order to mitigate the high cost of dredging to remove this material, the water levels in the 46.5-acre (18.8 ha) dock were maintained by pumping fresh water from the Holderness Drain. Pumps capable of pumping 14.5 million cubic feet (410 Ml) per day were installed, resulting in significant savings in the cost of operating the dock.

  6. Ballast water discharge and the environment - Wikipedia

    en.wikipedia.org/wiki/Ballast_water_discharge...

    Ballast water discharges are believed to be the leading source of invasive species in U.S. marine waters, thus posing public health and environmental risks, as well as significant economic cost to industries such as water and power utilities, commercial and recreational fisheries, agriculture, and tourism. [11]

  7. Ballast tank - Wikipedia

    en.wikipedia.org/wiki/Ballast_tank

    Cross section of a vessel with a single ballast tank at the bottom. A ballast tank is a compartment within a boat, ship or other floating structure that holds water, which is used as ballast to provide hydrostatic stability for a vessel, to reduce or control buoyancy, as in a submarine, to correct trim or list, to provide a more even load distribution along the hull to reduce structural ...