A recent paper designed an algorithm that can use recorded echoes from an array of microphones to measure the dimensions of a room. The figure below shows the set up of microphones in their controlled test area as well as the more complex Lausanne cathedral of Switzerland. What makes this a practical criminal catching tool? First, the microphones don't have to be placed in any specific geometry, you can use whatever arrangement is handiest. Second, it has been hypothesized that this algorithm could be programmed into a cell phone app.
Dokmanic, I., Parhizkar, R., Walther, A., Lu, Y. M., & Vetterli, M. (2013). Acoustic echoes reveal room shape. Proceedings of the National Academy of Sciences, 1221464110