(CNN)-- A floating city off the coast of San Francisco may sound like science fiction, but it could be reality in the not-too-distant future. The Seasteading Institute already has drawn up plans ...

The project promises to be a harmonious blend of modern living and environmental conservation. But the floating city’s costs are substantial, with estimates running into several million dollars.

“This year the challenge was above the current, where we've asked the students to build a city 100 years into the future as if it were floating on water.” From schools, to scouts, and even ...