Alright, here is a step-by-step guide on how to make a drowning chamber for goblins in Dwarf Fortress:

1. Find a suitable location for the drowning chamber. You want a spot where you can easily release the goblins into the chamber and flood it with water. You may also want to consider how you will dispose of the drowned goblin corpses afterwards.

2. Design the layout of your drowning chamber. You will need a chamber large enough to hold all the goblins, plus an area for the cages to be dropped off. You will also need a way to release the goblins into the chamber, such as a lever or a pressure plate.

3. Dig out the chamber. Use the Dig command to create the space for your drowning chamber.

4. Build a room to hold the cages. Use the Build command to create a room next to the drowning chamber where you can drop off the goblin cages. You can designate a space for the room using the designation tool.

5. Release the goblins from the cages. Select each cage and use the q command to view the cage's contents. Then use the r command to release the goblin inside.

6. Flood the drowning chamber. Use the Floodgate command to create a floodgate at one end of the chamber. Then connect the floodgate to a lever or pressure plate using the Lever or Pressure Plate command.

7. Pull the lever or trigger the pressure plate to flood the chamber. Once the goblins are inside and the floodgate is closed, activate the lever or pressure plate to flood the chamber with water. 

Here is an example of what the final drowning chamber could look like in ASCII art:

```
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#...........x.......#     x = Lever
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#####################
``` 

Note that this is just one possible design for a drowning chamber, and you can modify it to suit your needs.
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