Final answer:
The Bathysphere was the technology that did not allow researchers to further explore below the ocean's surface.
Explanation:
Bathysphere did not allow researchers to further explore below the ocean's surface. A bathysphere is a spherical capsule used for ocean descent but cannot go as deep as modern submersibles like Alvin or Remote Operated Vehicles (ROVs). These advanced vehicles enable exploration of the ocean floor by withstanding the extreme pressure, darkness, and cold of the deep sea.
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