using a material 1% as heavy as glass. 500m high, huge dirigibles are used during construction.
https://www.youtube.com/watch?v=e9k9yZhZXJk
Sapere Aude
using a material 1% as heavy as glass. 500m high, huge dirigibles are used during construction.
https://www.youtube.com/watch?v=e9k9yZhZXJk