The holiday season has just passed, and many may have heard the phrase, “good things come in small packages.” Does this hold true for today’s undersea vehicles? Indeed it does. One of the most striking recent trends in the field is the proliferation of compact and affordable, yet highly effective, undersea vehicles. The past decade has seen new remotely operated vehicles (ROVs) and autonomous underwater vehicles (AUVs) produced that are easily carried and deployed by one person. Capitalizing on developments in circuitry, sensors, and batteries inspired by the consumer electronics sector, these small vehicles punch above their weight class in practical applications.