Used since the mid-19th century on Earth, Barbed Wire and it's more threatening cousin, Razor Wire, is still a staple of basic defense on Mars. The cheaper barbed wire consists of evenly spaced spurs or barbs on a reinforced wire, while razor wire (barbed wire II) is stamped razors or burrs mounted to reinforced wire.

Both forms are easy to assemble and construct, even by unskilled labors. Neither are intended to completely stop an assailant, however they do slow the attackers progress, hopefully giving the structure's security measures time to turn on the attacker and drive them back.

Weapons | Defense | Intelligence | Security | Radar
Levels 1-5 Sand Mounds | Barbed Wire I | Barbed Wire II | Sandbag Walls I | Sandbag Walls II
Levels 6-10 Electric Fence I | Electric Fence II | Lava Moat I | Lava Moat II | Radioactive Walls I
Levels 11-15 Radioactive Walls I | Ion Fence I | Ion Fence II | Force Field I | Force Field II
Levels 16-20 Missile Defense I | Missile Defense II | Nuclear Defense I | Nuclear Defense II | Ultimate Defense
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