Benthos was a location associated with the Benthans.

Engineers on Benthos worked on a coaxial warp drive. (VOY: "Vis à Vis")

The Steth impostor claimed to be from the fourth planet of the Benthan system, and at one point told a story about having to limp back to Benthos, suggesting that Benthos was the name of that planet. However, later the real Steth took back the impostor entity to Bentha. How these three locations inter-relate is unknown.
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