The SUBWING is basically two connected wings that can be rotated independently of each other, which are being towed by a boat with a person hanging on. The speed varies about 2-4 knots, which means that even a small boat with a less powerful engine will have no problem towing the SUBWING. The first prototype consisting of two rotatable wings was made at sea by material found at a supermarket. Later, many more prototypes has been created and tested.