LTA Research, founded by Google co-founder Sergey Brin, has flown Pathfinder 1, the first large rigid airship since the 1930s, using helium instead of hydrogen.
Flying Whales is one of the growing number of players in the airship market. The company is developing the LCA60T airship which uses 14 non-pressurised helium cells to ascend and remain in the air.