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2. Dolphin (structure) - Wikipedia

   en.wikipedia.org/wiki/Dolphin_(structure)

   Wood pilings grouped into a pair of dolphins serving as a protected entryway to a boat basin. A dolphin is a group of pilings arrayed together to serve variously as a protective hardpoint along a dock, in a waterway, or along a shore; as a means or point of stabilization of a dock, bridge, or similar structure; as a mooring point; and as a base for navigational aids.

3. Detonating cord - Wikipedia

   en.wikipedia.org/wiki/Detonating_cord

   Higher-yield detonating cord can be used to cut down small trees, although the process is very uneconomical compared to using bulk explosive, or even a chainsaw. High-yield detonating cord placed by divers has been used to remove old dock pilings and other underwater obstructions.

4. Screw-pile lighthouse - Wikipedia

   en.wikipedia.org/wiki/Screw-pile_lighthouse

   Screw-pile lighthouse from Sea Stories, publ. 1910 by Century Co. N.Y. Maplin Sands screw-pile lighthouse (drawing published by Alexander Mitchell & Son in 1848). A screw-pile lighthouse is a lighthouse which stands on piles that are screwed into sandy or muddy sea or river bottoms.

5. Floating dock (jetty) - Wikipedia

   en.wikipedia.org/wiki/Floating_dock_(jetty)

   A floating dock, floating pier or floating jetty is a platform or ramp supported by pontoons. It is usually joined to the shore with a gangway. It is usually joined to the shore with a gangway. The pier is usually held in place by vertical poles referred to as pilings, which are embedded in the seafloor or by anchored cables . [ 1 ]

6. Screw piles - Wikipedia

   en.wikipedia.org/wiki/Screw_piles

   Large load capacity screw piles may have various components such as flat half helices, Bisalloy cutting tips and helices, cap plates or rebar interfaces for connection to various concrete or steel structures. Most industries use screw piling experts due to the cost efficiencies and, increasingly, the reduced environmental impact.

7. Marine construction - Wikipedia

   en.wikipedia.org/wiki/Marine_construction

   Barge outfitted with Cranes is towed into position. Marine construction is the process of building structures in or adjacent to large bodies of water, usually the sea. These structures can be built for a variety of purposes, including transportation, energy production, and recreation.