The Breathe Under Water project is made to address humans' lack of ability to breathe under water. It is designed to go along the surface, just below snorkelling level, but not to go as deep as scubadiving. Furthermore, it can help people who don't know how to swim or are incapable of it. It would be far cheaper than scuba diving equipment, so more people would be able to buy it. 

The Breathe Under Water works by separating the hydrogen and the oxygen from the molecule of the water. This process is called electrolysis. The hydrogen is let go through a tube, and the oxygen mixes with stored nitrogen using a sensor that detects the amount of oxygen and nitrogen needed (it has to be 21% oxygen and 79% nitrogen). This sensor regulates all the air you breathe. There's also a security sensor, in case you are not breathing the correct amount of the components.