Google co-founder Sergey Brin is spending $100 million to $150 million to build a blimp that will be the world's biggest aircraft when it's finished, according to The Guardian.

The blimp, as first reported by Bloomberg, is under construction at a giant hangar in the NASA Ames airfield near Google headquarters in Mountain View, California. Google signed a 60-year lease for $1.1 billion in 2014, through a subsidiary called Planetary Ventures, and is working with engineer Alan Weston, who is employed by a company known as LTA ("lighter than air") Research and Exploration. The company, controlled by Brin's family, was listed in Google's 2017 proxy as a lessor of part of the Ames hangar.

The blimp will be almost 656 feet (200 meters) long, The Guardian reports, and will go on humanitarian missions to remote locations as well as serving as an "air yacht" for Brin and his family.

Read the full Guardian report here.

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