Abstract: A method for developing a piece of land that is in danger of disappearing due to its small size above a seawater level, including covering the piece of land with a sealing dome larger than the piece of land such that a space is created between the piece of land and the sealing dome and such that a lower edge of the sealing dome is in the sea, securing the sealing dome, while leaving a gap between the lower edge of the sealing dome and a sea bottom, reducing the air pressure inside the sealing dome such that the seawater level inside the sealing dome rises above at least a part of the piece of land to allow coral to naturally grow on the at least the part of the piece of land, and returning the air pressure inside the sealing dome to the same air pressure as outside so that the naturally grown coral on the part of the piece of land becomes calcified coral by being exposure to air, and the calcified coral remains as a developed portion of the piece of land.

Abstract: Provided is a method for developing land through the workings of nature. An island (1) is covered with a sealing dome (3) larger than an aboveground part (1a) of the island such that a space (s1) is created between the island (1) and the sealing dome (3) and a lower edge (3a) of the sealing dome (3) is located in the sea, i.e., below the sea level (2). Subsequently, with a gap (s2) between the lower edge (3a) of the sealing dome (3) and a sea bottom (1b), a pile (4) secured to the lower edge (3a) of the sealing dome (3) with a bolt (not shown) is driven into the sea bottom (1b) to secure the sealing dome (3). Then, a pump (5) provided in the sealing dome (3) is actuated to reduce the air pressure of the sealing dome (3). According to the Pascal's law, this causes the seawater to be drawn into the sealing dome (3), allowing the sea level (2a) inside the sealing dome (3) to rise above the aboveground part (1a) of the island (1).