Like OMG Sublife - Mini rechargeable Submarine
Sublife - A water-activated Submarine! Simply drop the sub in the water (great for bathtubs AND pools!) and watch it automatically start, it will descend up to 2 meters, then it will run straight for about 40 seconds, then pause and ascend to the surface (like a submarine) for about 20 seconds, then automatically descend and start the process all over again!
Watch the video to see it in action! Great fun for all the family.