One of the most well-fortified enemy citadel.
Your activities of caputring numerous sectors have aroused the enemy's full alert.
This base is located at the centre of North Pole,though risky,taking it down help ease the ultimate enemy threat greatly.
Try to destroy this base,at all cost,the enemy will spare no mercy on you.
敌人的最坚固城堡之一。 你占领许多部门的活动引起了敌人的全面警觉。 这个基地位于北极的中心，虽然有风险，但将其击倒有助于极大地缓解最终的敌人威胁。 尽量摧毁这个基地，不惜一切代价。

Versionv7

Gamemodeattack

Planetserpulo

Threatextreme