With a combined investment of 96.4 billion won ($83.9 million) from the city government and a consortium of construction companies, the second island, named Viva and measuring 3,271 square meters (35,209 square feet), will be set up over two days beginning today and buoy on the river tomorrow. Currently, construction of the whole project is 58 percent finished. The other two islands, Vista (4,737 square meters) and Tera (1,200 square meters), will debut on the river later and the three islands that make up the Floating Island will be unveiled to the public in August, government officials said.

The buoy of Viva, the second biggest island after Vista, measures 85 meters (279 feet) long, 49 meters wide and 3 meters high, and weighs 2,000 tons. Only 80 centimeters of the buoy will be submerged underwater, and Viva will be able to accommodate and uphold facilities that weigh up to 6,400 tons. The island will be used mainly for entertainment and cultural events.

Construction workers will place 24 airbags, each measuring 2 meters in diameter and 12 meters in length, under Viva’s giant buoy. The airbags are made of a special rubber that can support a 2,000-ton buoy, and will enable it to keep afloat.

After construction workers set Viva’s buoy on the water, they will embed a 500-ton concrete block in the river bed and connect that to the buoy with metal chains to prevent Viva from moving or washing away.

Each island is designed to automatically control the tightness of the chains. If a flood raises the water level more than 16 meters, the metal chains of the floating islands will automatically tighten to keep the islands in their original locations. To ensure the stability of each island, the longest metal chain measures up to 69 meters, according to Kim of the Seoul city government.

A system will monitor the movements of the islands, and should one divert more than one meter away from its original location, it will be automatically returned to its home site.