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Submarine

Submarine

Made of

SteelIronWaterBattery

Brief description

A watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. Submarines use buoyancy control to submerge and surface, and they are essential for underwater exploration, research, and naval operations.

Use / Function

  • Underwater Exploration: Reaching depths inaccessible to divers for scientific study.
  • Naval Operations: Stealthy transport, surveillance, and strategic presence.
  • Research: Marine biology, geology, and oceanography.
  • Salvage and Repair: Locating and working on underwater structures or shipwrecks.

Operating principle

Submarines operate based on Archimedes’ principle and buoyancy control.

  1. Buoyancy: A submarine has ballast tanks that can be filled with either water or air.
  2. Submerging: To submerge, the ballast tanks are vented of air and filled with Water, increasing the submarine’s density until it is greater than the surrounding water (negative buoyancy).
  3. Surfacing: To surface, compressed air is blown into the ballast tanks, forcing the water out and decreasing the submarine’s density until it is less than the surrounding water (positive buoyancy).
  4. Propulsion: Usually powered by a Diesel Engine on the surface and an Electric Motor powered by Batteries when submerged (in non-nuclear versions).
  5. Steering: Uses hydroplanes (underwater wings) to control pitch and a rudder to control yaw.

How to create it

Basic Functional Model

  1. Pressure Hull: A strong, watertight cylinder (usually Steel) designed to withstand the immense pressure of the depths.
  2. Ballast System: Tanks surrounding the pressure hull with valves to admit water and high-pressure air systems to expel it.
  3. Propulsion System: An engine or motor connected to a Propeller through a watertight seal.
  4. Life Support: Systems to recycle air, remove carbon dioxide, and provide oxygen (or simply a large enough air reservoir for short trips).
  5. Navigation: Instruments like a periscope for seeing above the surface and sonar for detecting objects underwater.

Materials needed

  • Hull: High-strength Steel or Titanium (for extreme depths).
  • Sealants: Heavy-duty rubber and specialized gaskets for hatches and propeller shafts.
  • Ballast: Water and compressed air tanks.
  • Power: Batteries and an Electric Motor.
  • Windows: Thick acrylic or reinforced glass (if any).

Variants and improvements

  • Submersible: Small, often unpowered or limited-range craft launched from a “mother ship.”
  • Diesel-Electric: Uses diesel engines to charge batteries; can only stay submerged for limited times.
  • Nuclear Submarine: Uses a nuclear reactor for power; can stay submerged almost indefinitely as it doesn’t need air for combustion.
  • ROV/AUV: Remotely operated or autonomous underwater vehicles (unmanned).

Limits and risks

  • Pressure: If the submarine exceeds its “crush depth,” the hull will collapse instantly.
  • Air Quality: Carbon dioxide buildup is a constant threat in a sealed environment.
  • Entanglement: Risk of getting caught in nets, cables, or underwater structures.
  • Isolation: Limited communication with the surface and no easy escape in case of failure.