Open the Time Capsule by exposing the screws that hold the device together. The screws are concealed by the rubber base, which is the bottom surface of the device.
Use a heat gun or hair dryer to heat the rubber base, which softens the adhesive holding it on.
Starting in a corner, carefully lift the rubber base to prevent tearing. You can use a guitar pick or a small, plastic ruler to help separate the rubber from the metal.