Building a military submarine costs over $1 billion to make. But Tao Xiangli’s one-man homemade submarine costed him only $4,385. You see Xiangli here knows how to be a baller on a budget. He spent about 2 years to construct a submarine using electric motors, propellers, a depth control tank, and a periscope. Xiangli’s submarine pilot has to be able to fit in an old oil barrel to control it though.