The schematic is available to download. This machine allows a person to enter a door which a wall closes behind them, they hit a lever and water comes down to drown them....you can't breathe anywhere. There is one more door but it's for a moderator to reset the drowning mechanism.

Additional Notes

This is my own design. If you are wondering what world this is it is SEMA's rebuilding house and semi-automatic melon farm...which is why I didn't upload a world or seed link.