Here are the steps as requested...

To properly connect the hatches to lever #1 for a drowning chamber:

Build a lever through the build menu.
Place the lever within your fortress, preferably in a secure location.
Designate the location where you want to connect the hatches.
Build a hatch cover through the build menu.
Place the hatch cover at the designated location.
Link the hatch cover to the lever by selecting the lever and then selecting the hatch cover.
Repeat steps 4-6 for each hatch cover you want to connect to the lever.
To install the necessary bridges for a military drowning chamber:

Designate the location where you want to install the bridges.
Build two drawbridges through the build menu.
Place the drawbridges at the designated location, one on each side of the sally port.
Link the drawbridges to lever #1 by selecting the lever and then selecting each drawbridge.
When an enemy is detected, pull the lever to raise both drawbridges and trap the enemy in the sally port to drown.
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