Swamped

Odd...the tea in your cup is vibrating in some interesting patterns...something here is emmitting vibrations on a sub-audible level...with the right set up you could detect where it's coming from and what it is.

Set the tea on various surfaces and see if you can detect changes in it's vibrations.

And that gets you thinking...

Even if you can't think of an escape plan, maybe you can devise a way to gain more information about your captor and surroundings.

A prototype sound amplifier might be able to double as an eavesdropping device with little modification. With some additional calibration, you could use the bouncing sound waves to detect open corridors and cavities beyond your prison.

...make a hole in the wall, indeed!