Driven by one-man, the submersible watercraft concept has a tendency to sail both on and under the water surface. Considering the possibility that with growing pollution and population, it would be a tough thought to survive on land. Hence, the concept called Aqua was devised offering a stay under the ocean. Formed like a dolphin, this underwater means of transportation is an ideal one for a stay in water. The designer structure by Korean designers Sungchul Yang and Woonghee Han monitors optimism, supplies oxygen and look for ways to shield the driver from getting hurt with the water pressure.