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  2. Underwater habitat - Wikipedia

    en.wikipedia.org/wiki/Underwater_habitat

    However, some underwater habitats allow for these resources to be delivered using pipes, or generated within the habitat, rather than manually delivered. [1] An underwater habitat has to meet the needs of human physiology and provide suitable environmental conditions, and the one which is most critical is breathing gas of suitable

  3. Rule of threes (survival) - Wikipedia

    en.wikipedia.org/wiki/Rule_of_threes_(survival)

    Training in use of a liferaft – the rule will apply when exposed at sea. In survival, the rule of threes involves the priorities in order to survive. [1] [2] [3] The rule, depending on the place where one lives, may allow people to effectively prepare for emergencies [4] and determine decision-making in case of injury or danger posed by the environment.

  4. Underwater construction - Wikipedia

    en.wikipedia.org/wiki/Underwater_construction

    Underwater inspection of underwater structures, installations, and sites is a common diving activity, applicable to planning, installation, and maintenance phases, but the required skills are often specific to the application. Much use is made of video and still photographic evidence, and live video to allow direction of the inspection work by ...

  5. Tsunami-proof building - Wikipedia

    en.wikipedia.org/wiki/Tsunami-proof_building

    A tsunami-proof building is a purposefully designed building which will, through its design integrity, withstand and survive the forces of a tsunami wave or extreme storm surge. It is hydrodynamically shaped to offer protection from high waves. This thus causes the building to be dubbed 'tsunami-proof'.

  6. Underwater mortgage: What it is and what to do - AOL

    www.aol.com/finance/underwater-mortgage...

    When you owe more on your mortgage than your house is worth, the loan is referred to as 'underwater,' or in a state of negative equity. Having an underwater mortgage makes it harder to sell the ...

  7. Submerged floating tunnel - Wikipedia

    en.wikipedia.org/wiki/Submerged_floating_tunnel

    Submerged floating tunnels can be anchored to the seafloor (left) or suspended from a pontoon (right) A submerged floating tunnel (SFT), also known as submerged floating tube bridge (SFTB), suspended tunnel, or Archimedes bridge, is a proposed design for a tunnel that floats in water, supported by its buoyancy (specifically, by employing the hydrostatic thrust, or Archimedes' principle).

  8. Escape trunk - Wikipedia

    en.wikipedia.org/wiki/Escape_trunk

    Submarine escape trunk View inside a submarine escape trunk, looking up from below the lower hatch. An escape trunk is a small compartment on a submarine which provides a means for crew to escape from a downed submarine; it operates on a principle similar to an airlock, in that it allows the transfer of persons or objects between two areas of different pressure.

  9. Seagrass meadow - Wikipedia

    en.wikipedia.org/wiki/Seagrass_meadow

    A seagrass meadow or seagrass bed is an underwater ecosystem formed by seagrasses. Seagrasses are marine (saltwater) plants found in shallow coastal waters and in the brackish waters of estuaries. Seagrasses are flowering plants with stems and long green, grass-like leaves.