Variable-buoyancy propulsion
= Variable-buoyancy propulsion
{wiki=Variable-buoyancy_propulsion}
Variable-buoyancy propulsion is a technique used primarily in underwater vehicles or submersibles to control their depth in water by adjusting their buoyancy. This method involves changing the amount of water or air inside a buoyancy control system, such as ballast tanks, allowing the vehicle to ascend or descend efficiently without relying solely on traditional propulsion methods.