• Dig out an empty shaft above the intended flooding location
 • A 3 z-level shaft will quickly fill a room of a similar size
 • Make some channels in the floor and install hatches over the holes
 • Connect the hatches to lever #1
 • A military drowning chamber can be a simple sally port
 • Sally port is a secondary hallway leading into your fortress with bridges on both sides
 • Close down your main entrance upon seeing the enemy
 • Leave the secondary entrance open to drown the enemy goblins.
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