It's not every day you come across a submersible with wheels, but this steel diving craft was billed as more of an underwater car than a miniature submarine anyway. This invention not only transported divers to the bottom of the sea, but it provided them with cots, benches, tools, oxygen-filled tanks, pressurized acetylene, and a searchlight to guide their work. After the craft finished its descent (with help from a scow and a heavy crane), the divers could drive it using a built-in motor. As you can see on the image at the left, rear wheels used treads to ease the task of driving along the muddy ocean floor.
Read the full story in "To the Bottom of the Sea in an Automobile"