A team led by Faris Rajak Kotahatuhaha proposed re-freezing sea water in the Arctic. It has aimed to create miniature modular icebergs It uses a submarine-like vessel, in a bid to fight climate change. The team was awarded second prize in the contest for its geoengineering proposal to re-freeze the Arctic and transform sea water into new ice fields.

They through this, converted water into hexagonal blocks of ice that nest together to form new ice floes. The main goal of this idea is to restore the ecosystem ( mainly Polar) , which has a direct effect on the global climate.The concept is a active response to issues related to the melting of the earth's polar ice. 

Working Procedure of re-freezing: The submarine-like vessel would sink to collect sea water in a central hexagonal tank and  the turbines would then be used to blast the tank with cold air and accelerate the freezing process. During the process, the vessel would return to the surface and the tank would be covered to protect it from sun. 

Once the water is frozen, the vessel would submerge again, leaving behind an "ice baby" with a volume of 2,027 cubic-metres. These miniature icebergs would then group together in a pattern to form a larger ice.

Multiple vessels could be used continuously for this process.

Image Source: Google