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2. Underwater construction - Wikipedia

   en.wikipedia.org/wiki/Underwater_construction

   Underwater demolition, for removal of damaged structure in repair work, or to prepare an area for new construction. Underwater surveying : site surveys and geological surveys Underwater inspection of underwater structures, installations, and sites is a common diving activity, applicable to planning, installation, and maintenance phases, but the ...

3. Underwater cutting and welding - Wikipedia

   en.wikipedia.org/wiki/Underwater_cutting_and_welding

   Underwater construction is industrial construction in an underwater environment. There is often, but not necessarily, a significant component of commercial diving involved. [2] [3] It is a part of the marine construction industry. [4] Underwater welding may be used, and for repair work cutting of steel or concrete may be necessary.

4. Tremie - Wikipedia

   en.wikipedia.org/wiki/Tremie

   Assembled tremie placing concrete underwater Hopper, pipes and lifting cap components of a tremie concrete placement tube. A tremie is a watertight pipe, usually of about 250 mm inside diameter (150 to 300 mm), [1] with a conical hopper at its upper end above the water level. It may have a loose plug or a valve at the bottom end.

5. Diving activities - Wikipedia

   en.wikipedia.org/wiki/Diving_activities

   Underwater concrete placement may be by tremie, pumped concrete, skip placement, or toggle bags. Concrete repair, and assembly of pre-cast components often involves grouting . Other work may include fitting fixing bolts by drilling and core drilling , pipe installation (outfalls), pipeline support and protection, using mattresses for ballast ...

6. Sweden opens sabotage probe into Baltic undersea cable damage

   www.aol.com/baltic-undersea-cable-likely-damaged...

   Sweden's Security Service has seized control of a vessel as part of the probe, the country's prosecution authority said. "We are now carrying out a number of concrete investigative measures, but I ...

7. Auxiliary floating drydock - Wikipedia

   en.wikipedia.org/wiki/Auxiliary_floating_drydock

   ARDC-13, An Auxiliary Repair Dock, Concrete Auxiliary Repair Dock, Concrete under tow. Auxiliary Repair Dock, Concrete were mobile dry docks made of concrete, due to the shortage of steel during World War II. ARDC had a 2,800 ton lifting capacity. ARDC were 389 ft (119 m) long, 84 ft (26 m) wide, and 40 ft (12 m) deep.