Choosing Ideas

Everyone from our group had to present their ideas in front of the class. Then the class voted for the best ones. Unfortunately my idea didn't get through. From the chosen ideas we could choose which group do we want to work for. I've chosen the idea of the city inside of huge jellyfish. Here is the story:

After a foreseen global catastrophe suddenly fast-tracked unexpectedly to the year 2120, Earth was left flooded up to 3000 meters above sea level. Nearly all land species have died out including the human race due to the extreme change of environmental conditions, thus leaving very small groups left alive. A large group created a set of facilities that would be able to withstand this change of environment, enabling them to find a new home. The sea life has thrived with all but a few of their predators left alive, allowing them to feed more than ever before and grow to enormous sizes. Drifting across the sea in their facilities, the recent human survivors of the water rise encountered a colossal jellyfish. The date is now 2170 – almost 50 years has passed since the cataclysm shook every corner of the world. Restoration of a now-endangered species has arisen an underwater metropolis housed by a goliath, floating organism discovered shortly after the cataclysm; civilisation now resides as an incubated race under water.