Definition
A bathysphere is a spherical, deep-sea observation chamber lowered into the ocean by a cable from a surface ship. Think of it as an underwater elevator, but less mobile and more like a fixed observation post. Unlike a bathyscaphe, it cannot move independently. It's designed for withstanding immense pressure, allowing scientists to observe deep-sea life in its natural habitat. It’s a historical predecessor to more advanced submersibles, offering early glimpses into the deep ocean. Imagine a metal ball dangling in the dark abyss.