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Do submarines need to surface?

Author

David Ramirez

Updated on March 18, 2026

Do submarines need to surface?

A submarine comes to the surface once every few days (or even more frequently than that), not only to get a fresh supply of atmospheric oxygen from above the water's surface, but also to dispose of the waste gases that it produces onboard.

Likewise, people ask, why do submarines need to surface?

A submarine comes to the surface once every few days (or even more frequently than that), not only to get a fresh supply of atmospheric oxygen from above the water's surface, but also to dispose of the waste gases that it produces onboard.

Additionally, how often does a submarine need to surface? While old diesel submarines needed to surface in a matter of hours or a few days at best to recharge batteries, new AIP powered vessels only need to surface every two to four weeks depending on type.

People also ask, do submarines need to surface for air?

Submarines spend months submerged – where do they get oxygen and drinking water from? Nuclear submarines can spend months without emerging to the surface. Air, of course, is very important, but let's start with water problems. Although sea water is too salty to be consumed, it works perfectly well in the toilet.

Do nuclear submarines have to surface?

Nuclear generators need no oxygen, so a nuclear sub can stay underwater for weeks at a time. Also, because nuclear fuel lasts much longer than diesel fuel (years), a nuclear submarine does not have to come to the surface or to a port to refuel and can stay at sea longer. The reactor in a nuclear ship is smaller.

Why can't you shoot in a submarine?

Because standard bullet ammunition does not work well underwater, a common feature of underwater firearms is that they fire flechettes instead of standard bullets. The barrels of underwater pistols are typically not rifled. The lack of rifling renders these weapons relatively inaccurate when fired out of water.

Are submarines faster underwater or on the surface?

Which is faster? A submarine meets more resistance under-water as opposed to on the surface, as on the surface a small fraction of the hull surface is meeting against air resistance instead of water resistance. This does not, however, mean that a submarine travels faster on the surface.

How deep can US subs go?

It's generally accepted that the maximum depth (depth of implosion or collapse) is about 1.5 or 2 times deeper. The latest open literature says that a US Los Angeles-class test depth is 450m (1,500 ft), suggesting a maximum depth of 675–900m (2,250–3,000 ft).

Can you survive a submarine sinking?

There are two options available for the crew of a submerged disabled submarine (DISSUB); escape or rescue. Escape is the process where the DISSUB's crew leaves the boat and reaches the surface without external assistance; while rescue is undertaken by outside parties who remove the trapped crew from the submarine.

How does a submarine resurface?

It works like this: when the submarine is above the surface of the water, the ballast tanks are filled with air, which means that the overall density of the submarine is less than the water it displaces. Ballast tanks are alternatively filled with water and compressed gas to submerge and resurface a submarine.

Where does poop go on a submarine?

Usually it sinks by itself, but some scrap metal can be added to aid its journey to the bottom of the ocean. Therefore, yes, submarines do produce trash that is thrown out into the ocean and it is terrible.

How do submarines get fresh water?

Most submarines have a distillation apparatus that can take in seawater and produce fresh water. The distillation plant heats the seawater to water vapor, which removes the salts, and then cools the water vapor into a collecting tank of fresh water.

What is the longest time a submarine has stayed submerged?

The longest submerged and unsupported patrol made public is 111 days (57,085 km 30,804 nautical miles) by HM Submarine Warspite (Cdr J. G. F. Cooke RN) in the South Atlantic from 25 November 1982 to 15 March 1983.

How long can nuclear subs stay under water?

The nuclear submarine that can remain underwater for 25 years. In a Barrow-in-Furness shipyard, Stuart Godden, the director of engineering for BAE Systems' submarines division in Cumbria, is narrating a slide show and comparing the UK's latest submarines programme – the Astute class – to Nasa's Space Shuttle programme.

How long can subs stay underwater?

Submarines generally stock a 90-day supply of food, so they can spend three months underwater. The diesel-powered submarines (not now used by the United States Navy) had a limit of several days submerged.

How do you breathe on a submarine?

How do you breathe onboard a submarine?
  1. Electrolysis. Submarines produce the majority of the oxygen they need by liberating it from the surrounding water.
  2. Oxygen Candles. A chlorate candle, or an oxygen candle, is a cylindrical chemical oxygen generator that contains a mix of sodium chlorate and iron powder.

What keeps a submarine from rolling over?

The answer lies in the weight-buoyancy relation maintained in submarines. When the weight of the submarine is more than the buoyancy, it sinks until any corrective action is taken to reduce the weight or increase the buoyancy. This condition is called Negatively Buoyant.

Which country has the most advanced submarines?

Currently top 10 attack submarines in the world are these:
  • Nr.1 Seawolf class (USA)
  • Nr.2 Virginia class (USA)
  • Nr.3 Astute class (United Kingdom)
  • Nr.4 Graney class (Russia)
  • Nr.5 Sierra II class (Russia)
  • Nr.6 Improved Los Angeles class (USA)
  • Nr.7 Akula class (Russia)
  • Nr.8 Soryu class (Japan)

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Do submarines need to surface?