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The Submarine Berth is a base building in Bloons Monkey City Mobile that unlocks the Monkey Sub tower. It is unlocked when the player beats the Submarine Alliance special mission.

Infobox Buildings
Submarine berth
Information
Level Unlocked When the Submarine Alliance
special mission is completed
Size 3x3 (1 tile)
Building Type Unit Building
Cost $300
Unlocked/Upgrade Monkey Sub