Quick search surfaced the following for Linux:
k3b, where the source repo states bluray burning capabilities.
xfburn also mentions bluray burning capabilities.
For Windows, albeit old and unupdated, I know the following still works for other purposes (never tried bluray burning/writing though):
ImgBurn mentions bluray burning/writing capabilities, but never tried it.
Bonus: not capable of bluray burning/writing but just fun to mention for any still into ripping/writing to discs on Windows:
InfraRecorder, simply a classic, and it’s open source!
Depends on if enough of the team is superstitious, and fears their findings will lead to a greater disturbance unleashing a long forgotten ancient force that may devastate the region.
Buuut that’s highly unlikely, so yeah, weird they didn’t reach out. Unless they were the superstitious ones in a different way and wanted to be first to seize an ancient power (or less interestingly, they wanted the credit for the finding and didn’t want to let on what they were looking for).