In 1931, Auguste Piccard used Hydrogen to raise himself up to the stratosphere.
He made it over 50,000 feet above sea level.
And he described the Earth as being a flat disc with an upturned edge!!
https://blossom.primal.net/18ac75c6ffb9bc76a6a2df29358402a93d53561355113ad9dab5c2260eaf9c1c.mov