In an official statement, the company explains that the propellant type is the most efficient, cheapest, and safest choice for commercial reusable rockets. Still, they explained that due to kerosene-liquid oxygen’s inherent regulation and stability issues,

Deep Blue Aerospace launched its Nebula-1 rocket for its first high-altitude recovery test flight on Sunday, and attempted to land it back at the Ejin Banner Spaceport in Inner Mongolia. The rocket lifted off to an altitude of around 3 miles (5 kilometers) above the ground but it fumbled the landing,

Despite meeting 10 out of 11 objectives during the trial, the rocket encountered issues in its final phase, leading to a crash.