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  2. Anti-submarine weapon - Wikipedia

    en.wikipedia.org/wiki/Anti-submarine_weapon

    Mk. 17 depth bomb is being unloaded from a SOC Seagull scout plane on board the USS Philadelphia (CL-41) during an Atlantic U-boat sweep near Panama in June 1942. Air-dropped depth bombs were normally set to explode at a shallow depth, while the submarine was crash-diving to escape attack.

  3. Pit latrine - Wikipedia

    en.wikipedia.org/wiki/Pit_latrine

    Therefore, the full depth of the pit walls are lined to prevent collapse and the top 30 cm (12") are fully mortared to prevent direct infiltration and to support the superstructure. [ 30 ] There is a risk of groundwater pollution when pits are located in areas with a high or variable water table, and/or fissures or cracks in the bedrock.

  4. List of sinkholes - Wikipedia

    en.wikipedia.org/wiki/List_of_sinkholes

    Lake Peigneur – was originally a shallow freshwater body in Louisiana, until a man-made disaster on November 20, 1980 changed its structure, affecting the surrounding land and making it a brackish water lake; Little Salt Spring – a feature of the karst topography of Florida; Makauwahi Cave – the largest limestone cave found in Kauai, Hawaii

  5. Shaft sinking - Wikipedia

    en.wikipedia.org/wiki/Shaft_sinking

    Where the depth of bedrock is too great to for a box cut to be economically viable, or the bedrock is not strong enough, civil engineering techniques such as diaphragm walls or concrete piles may be used to create a deep foundation instead. Pre-Sink. The pre-sink is the excavation and support of the first 60 – 100 metres of the shaft barrel ...

  6. Sink - Wikipedia

    en.wikipedia.org/wiki/Sink

    A sink is a bowl-shaped plumbing fixture for washing hands ... (18 in) front-to-back, with a depth of 22.5 centimetres ... and both sinks are now shallow. [5]

  7. Little Salt Spring - Wikipedia

    en.wikipedia.org/wiki/Little_Salt_Spring

    Little Salt Spring was considered a shallow freshwater pond, but in 1959 SCUBA divers William Royal and Eugenie Clark discovered that it was a true sinkhole extending downward over 200 ft (61 m), [4] [8] similar to the cenotes of the Yucatán Peninsula (another karst region). The actual depth of the surface pond is forty feet (12.2 m) with a ...

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