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How do you know a submarine is going to surface?

Updated: 8/18/2019
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14y ago

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In most cases you won't - there isn't any visual warning, and unless thermal layers near the surface prevent the submarine's Sonar crew from hearing a close-aboard contact, a submarine already knows which surface contacts are around and is already tracking them while at Periscope Depth, which is the normal procedure prior to a normal surfacing. As such, it will only surface when it is a safe enough distance from those contacts to avoid any problems, as submarines are visually difficult to spot in the water, even during the daylight on the surface.

There are 2 methods of surfacing - a Low Pressure Blow, which uses an onboard high CFN blower while the boat is a Periscope Depth to draw air from the snorkel mast and force it slowly into the Main Ballast Tanks, and bringing it to the surface, or an Emergency Blow, which is only used in critical casualties where the boat needs to get to the surface as fast as possible. During an EB, high-pressure compressed air is dumped into the MBT's, and as the boat begins to rise, air expands in the tanks as sea pressure lessens, further increasing buoyancy. Once on the surface, the LPB, or if damaged, the Diesel Generator, are used to force any remaining water out of the MBT's.

If you're lucky enough to spot a submarine periscope (and most won't before it surfaces, as boats won't surface if there's a surface vessel within a certain range for marine safety considerations), and see white foam and bubbles coming from the sides of the hull, it's a good indication that the boat is surfacing using the LPB. Usually though, submarines tend to surface in areas where there aren't any surface contacts near enough to visually see them.

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Q: How do you know a submarine is going to surface?
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