(CNN) — The smooth, white underbelly of the airborne whale sails across the sky, casting a shadow across the forest below.
Other than its enormous size, though, this "whale" has very little to do with its animal namesake. It's an airship, and French aeronautics company Flying Whales hopes its hybrid-electric, helium-lift vessel will change the shape of sustainable transport.
The airship could help solve the problem of how to transport cargo "when infrastructure is lacking, or just doesn't exist at all," says Romain Schlack, Flying Whales' head of communications. "We are going to add new possibilities to global logistics, while overcoming obstacles and problems on the ground."
Airship technology has been around for over 150 years and gained popularity in the early 1900s ferrying passengers and cargo across land and ocean. But as airplanes became faster and more advanced, airships couldn't keep up. Then, in 1937, an airship called the Hindenburg burst into flames, killing 36 people, firmly marking the end of the golden age of airships.
Now, nearly 90 years later, interest in the lighter-than-air transport is reviving. With low carbon emissions, and no requirement for expensive ground infrastructure like airports or roads, because they can load and unload cargo while hovering, airships could be a sustainable solution for logistics across the globe.
Flying Whales is developing a 200-meter-long airship that will be lifted by 14 cells filled with helium gas, and then propelled through the air by a hybrid-electric system powered with sustainable aviation fuel.
Flying Whales' airships, pictured here in a render, could access remote locations without roads, railways or airports.
Carrying at least two crew members, the airships will be able to up to transport 60 tons of cargo -- around the same as two to three freight trucks.
Schlack says the "flying whales" are designed to carry heavy, bulky items such as blades for wind turbines, logs collected from steep mountainsides, or construction materials being delivered to remote, isolated locations. Airships could also deliver food or aid after natural disasters, when railways or roads might be inaccessible.
Compared to helicopters, which are the go-to transport for remote cargo deliveries, Flying Whales claims its airships will produce less than 10% of the carbon emissions while operating -- plus their freight system leaves wilderness and countryside untouched, while still connecting small, rural communities to the wider global supply chain.
Hydrogen versus helium
Flying Whales is not the only company trying to revive airships: other startups, such as LTA Research, backed by Google co-founder Sergey Brin, are also exploring this low-impact transport solution.
But a key question facing manufacturers is which lighter-than-air gas to fill the balloons with: hydrogen or helium?
Hydrogen is cheap, renewable, and has more lifting power than helium. However, it's highly flammable and has long been associated with devastating airship disasters like the Hindenburg.
That's why most companies, including Flying Whales and LTA Research, are using helium, which is non-flammable.
San Francisco-based LTA Research is building its helium-lift airship, Pathfinder 1, inside facilities at Moffett Field in California (pictured).
However, helium is less buoyant than hydrogen and more expensive, with unstable prices: between 2011 and 2016, its price increased 250%, and in 2020, it was up to 67 times more expensive than hydrogen.
More importantly, though, the helium supply could run out.
At current usage rates, the American Chemical Society says it could go extinct within the next century. That's a problem because helium is vitally important for a variety of industries. It's used in medical equipment like MRI machines, and there is currently no alternative.
Barry Prentice, professor and former director of the transport Institute at the Asper School of Business at the University of Manitoba, says that's why it's vital that airships start using hydrogen again.
Prentice is also the founder and president of BASI, a Manitoba-based company specializing in airships adapted for cold climates. The company is developing an airship that uses hydrogen for lift, in the hope that the Canadian government will relax its regulations on the use of hydrogen. Advancements in science and technology over the last century have made the gas safer to use, says Prentice. For example, hydrogen is only flammable when mixed with air, something that might occur if there is a leak in the balloon -- which is what's suspected to have happened on the Hindenburg. Modern technology such as "hydrogen sniffers" which detect leaks can help manage this, says Prentice.
California-based company H2 Clipper is currently developing an airship (pictured here in a render) that uses hydrogen for lift.
BASI is not the only organization pursuing hydrogen-lift airships: FlyWin, an airship design project based at the Université Libre de Bruxelles in Belgium is exploring materials and design to allow safe use of hydrogen, while hydrogen delivery company H2 Clipper is aiming to have its hydrogen-lift airship in commercial operation before 2030. Those opting for helium say that the volume needed for airships is minimal compared to the supply. "Each airship will be filled with 180,000 cubic meters of helium," says Schlack. With 160 million cubic meters produced globally in 2021, each airship would account for around 0.1% of annual helium production. "We are pretty confident in the supply for our aircrafts," he says, adding that helium isn't consumed by airships, but is "stored" in the balloons, and only requires small top ups from time to time.
Scaling up, up and away
Choice of gas isn't the only challenge -- scale is also an issue.
"There's no such thing as a small airship," says Prentice. Companies need to invest in giant workshop spaces, and prototypes need to be tested, altered, and re-tested successfully before a commercial production line can even be considered, he says.
Flying Whales plans to build its first hangar and assembly line next year in Laruscade, near Bordeaux, France, but other companies are getting ahead by using historic hangars.
LTA Research purchased Akron Airdock in Ohio, built in 1929, and leases Hangar Two at Moffett Field near San Francisco Bay in California, built in 1933. And UK-based Hybrid Air Vehicles (HAV) is making use of hangars at Cardington Airfield, in the south of England, which were used to build airships in the 1920s and 1930s.
The Airlander 10, a hybrid aircraft built by HAV, conducted its first voyage in 2016, and is pictured here during a test flight the following year.
Hybrid Air Vehicles Ltd
Finding premises has given these companies a head start. LTA's 400-foot (122-meter) long prototype is already floating inside its California hangar and HAV tested its first hybrid aircraft, the Airlander 10, in 2016.
Flying Whales expects to test its first airship at the end of 2025, with commercial operations beginning in 2027 once the airship is certified. Schlack says the company plans to rapidly scale up production after that. It has a second assembly line planned for Quebec and is searching for a partner in Asia to set up a third.
The company raised €122 million ($130 million) last year, which it will use to grow the teams at its offices in France and Canada, and is already discussing needs and requirements with prospective clients, ahead of launching its commercial services.
"Our goal is to have airships more or less everywhere," says Schlack.
A previous version of this article stated that LTA Research owns Hangar One near San Francisco Bay. The company leases Hangar Two.