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 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
A sally port is a secondary hallway leading into your fortress with bridges on both sides
Upon seeing the enemy, close down your main entrance while leaving the secondary open
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