Submarines go up and down in the water by changing its weight by displacing water...but how do humans go deeper or come up to the surface? We propel ourselves in the down or up direction using our hands and legs.....in this video we make use of a similar technique of using a propellor to dive deeper or float to the top and have made probably the worlds quickest DIY RC submarine.
Without the lights then one can actually make this under 5-10 mins
