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A dark submarine hull blends into the dim water around it, while a research vessel needs to stand out so people spot it easily. One is trying to disappear; the other dresses like a floating highlighter.
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Most modern attack submarines reach about 30 to 40 miles per hour underwater; going faster can create cavitation bubbles and noise that gives away their…
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Passengers stay in a sealed pressure hull while the vessel controls its depth using ballast and other buoyancy systems. The water remains outside the viewing…
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A smuggling boat can hide most of itself underwater. Many so-called narco-subs are low-profile or semi-submersible craft rather than deep-diving submarines.…
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A submarine’s pressure hull has to withstand enormous water pressure, and a window would create a vulnerable opening in that strong shell. Periscopes and…
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Where a hatch passes through the pressure hull, its opening, seal, and surrounding structure must withstand external water pressure. Compact dimensions help…
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A surfaced submarine sits low in the water and is hard for other ships to spot, especially in poor visibility. Its horn sends a warning through the air to…
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