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| Construction Cost |  500 ·  8 ·  3 ·  3 ·  3
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| Maintenance Cost |  -40 ·  -4 | |||
| Size | 3x3 | |||
| Hitpoints | 2000 | |||
| Unlock | 50 Lab Assistants | |||
The Offshore Defense is the only turret that can be built underwater. This turret fires torpedoes at enemy submarines, but cannot shoot at ships or aircraft. Its attack power is -/-/18 (3 DPS).