Confined space inspection drone specialist Flyability says it has raised more than $15 million in new funding to enhance the sensing and autonomy capabilities of its latest product, Elios 3.

The funding comes as part of the Switzerland-based company’s Series C, on top of the $7 million it had already closed.

While Japan-based SBI Investment led the round, Flyability’s backers also include some of its key customers. Investors Cargill and Dow, for example, have used Flyability’s inspection technology to keep their workers out of potentially dangerous spaces during inspections. Dow’s global robotics technology leader Marty Robinson says:

Flyability’s constantly evolving technology has gone beyond simple confined space elimination for visual inspections to a more advanced platform, adding new sensors and capabilities for future expansion. Innovative robotic solutions like the Elios 3 continue to accelerate our sustainability and safety goals.