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MarsDefensePerimeter

Three attack ships of the Mars Defense Perimeter in 2367

The Mars Defense Perimeter was part of the Federation planetary defenses of the Sol system. It was designed to protect the inner planets of the system, and specifically Earth, from intruding hostile starships. The defense perimeter consisted of a series of attack ships.

In early 2367, an attacking Borg cube crossed the planetary defenses between Jupiter and Mars. It was able to easily break through the defensive lines, destroying the ships sent to intercept it within a matter of seconds. (TNG: "The Best of Both Worlds, Part II")

In 2368, a ship of the same type was stored in the ship graveyard of Surplus Depot Z15. (TNG: "Unification I")

In the same year, a ship of this type was also used as the unmanned soliton wave rider test ship. (TNG: "New Ground")

The attack ships were called unmanned pods in the script of "The Best of Both Worlds, Part II". [1]
The Mars defense vessels were constructed from models of Typhoon- and Los Angeles-class submarines.
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